文章编号：1009-6248(2006)01-0001-49
天山石炭-二叠纪大火成岩省裂谷火山作用与地幔柱
夏林圻，李向民，夏祖春，徐学义，马中平，王立社
（西安地质矿产研究所，陕西 西安710054）
摘 要：中国西北部石炭纪—早二叠世喷发的天山裂谷火山岩系构成了一个大火成岩省。该火山岩系的组成以玄武质熔岩为主，其次有中性和酸性熔岩及火山碎屑岩。根据岩石学、主元素、微量元素和Sr-Nd-Pb同位素数据，天山玄武岩可分为两个主要岩浆类型：①高Ti/Y（HT）类型，以高Ti/Y（>500）、高Ce/Y（>3）和相对低Nb/Zr（<0.11）、低?εNd?(t)为特征；②低Ti/Y（LT）类型，以低?Ti/Y（<500）为特征。LT熔岩又可以进一步分为两个亚类：LT1熔岩以低Nb/Zr（<0.15）和高?εNd?(t)（+3.1~+9.7）为特征；LT2熔岩具有较高的Nb/Zr值（>0.16）和较低的εNd(t)值（-0.98~-2.91）。元素和同位素数据表明，HT和LT熔岩的化学变异不是由一个共同母岩浆的结晶分异作用所产生。它们极有可能是源于一种似洋岛玄武岩源的幔源〖BF〗（87Sr/86Sr(t)≈0.7045,εNd(t) ≈+4,206Pb/204Pb(t)≈18.35,207Pb/204Pb(t) ≈15.66,208Pb/204Pb(t)≈38.25, La/Nb≈0.7），且具有不同的熔融条件和经受了不同的分异和混染。以碱性熔岩为主的HT熔岩是产生于幔源石榴子石稳定区的低度部分熔融，其化学变异受控于单斜辉石(Cpx）［±橄榄石（Ol）］分离作用。相反，LT类型的母岩浆则是形成于幔源的尖晶石—石榴子石过渡带：碱性LT2亚类的母岩浆是产生于部分熔融程度较低的条件下；而以拉斑玄武质为主的LT1亚类的母岩浆则是产生于部分熔融条件较高的条件下。它们经受了浅层辉长岩质分离作用，化学变异较大。天山玄武岩可能是产生于地幔柱头。HT和LT岩浆的岩石成因又进一步为地壳和岩石圈地幔的混染作用所复杂化。我们的研究揭示，天山大火成岩省的火山岩中存在空间上的岩石地球化学变化。天山东段的LT1火山岩系的厚度最大，它们记录了玄武岩侵位的主幕，该处可能是地幔柱或地幔熔融异常的中心位置。相反，厚度较小的HT和LT2玄武岩则可能是意味着地幔柱活动影响的减弱。事实上，HT和LT2玄武岩也是该大火成岩省边缘部分的主要岩浆类型。HT和LT2熔岩的地幔熔融程度较低，可能是与地幔柱边部的岩石圈相对较厚和地热较低有关。?
关键词：天山玄武岩；地球化学；岩石成因；大火成岩省；地幔柱；大陆岩石圈；中国西北?中图分类号：P588?14 文献标识码： A
Carboniferous-Permian Rift-Related Volcanism and Mantle Plume in the Tianshan, Northwestern China
XIA Lin-qi, LI Xiang-min, XIA Zu-chun, XU Xue-yi, ?MA Zhong-ping, WANG Li-she?
(Xian Institute of Geology and Mineral Resources, Xian 710054, Shaanxi, China)
Abstract： The Tianshan rift-related volcanic rocks make up a large igneous provi
nce erupted during the Carboniferous.Early Permian period in northwestern China. The volcanic successions comprise thick piles of basaltic lavas and subordinate intermediate and silicic lavas and pyroclastics. Based on petrographic, major and
trace element, and Sr-Nd-Pb isotope data, the Tianshan basalts can be classified into two major magma types. These are: (1) a high?Ti/Y (HT) type that exhibits high Ti/Y (>500), Ce/Y (>3), and relatively low Nb/Zr (< 0.11) and ?εNd(t) (-1.15); (2) a low?Ti/Y (LT) that has low Ti/Y (< 500). The LT lavas can be futher divided into two subtypes. LT1 lavas exhibit lower Nb/Zr (<0.15) and higher ?εNd(t) (+3.1to+9.7); LT2 lavas have higher Nb/Zr (> 0.16) and lowerεNd(t) (=-0.98to-2.91). ?Elemental? and isotopic data suggest that the chemical variations of the HT and LT lavas can not be explained by crystallization from a common parental magma. Instead, they most
likely originated from an oceanic-island-basalt-like mantle source (87Sr/86Sr (t)≈0.7045, ?εNd?(t)≈+4,206Pb/204Pb(t) ≈18.35,207Pb/204Pb(t)≈15.66,208Pb/204Pb(t)≈38.25, La/Nb≈0.7) under various melting conditions and underwent distinct differentiation and contamination processes. The predominantly HT alkaline lavas were generated by low degrees of partial melting in the garnet stability field of the mantle source. The chemical variation of the HT lavas is controlled by a clinopyroxene (Ｃpx) ［±olivine (Ｏl)］ fractionation. In contrast, parental magmas of the LT type were generated by lower degree of partial melting for the LT2 (alkaline) subtype and by higher degree of partial melting for the LT1 (predominantly tholeiitic) subtype of the mantle source around the spinel?garnet transition zone. These magmas were then subjected to shallow level gabbroic fractionation, which led to larger chemical variation. The Tianshan basalts may result from a starting mantle plume. The petrogenesis of both the HT and LT magmas was further complicated by contamination of crust and lithospheric mantle. Our data show that spatial petrogeochemical variations exist in the volcanic rocks of the Tianshan large igneous province. The location of the thickest LT1 volcanic succession, which may record the main episode of the basalt emplacement, in the eastern Tianshan may have been centered over the mantle plume or mantle melting anomaly. In contrast, the less abundant HT and LT2 basalts may imply a weakening of the influence of the mantle plume activity. In fact, the HT and LT2 basalts are the dominant magma type in the periphery of the province. The lower degrees of mantle melting of the HT and LT2 lavas may be the result of a relatively thicker lithosphere and lower geotherm. ?
Key words：Tianshan basalts; geochemistry; large igneous province,mantle plume;
Northwestern China
?
文章编号：1009-6248(2006)01-0050-26
天山中西段古生代花岗岩TIMS法锆石U-Pb同位素定年及岩石地球化学特征研究
徐学义1，马中平1,2?，夏祖春1，夏林圻1，李向民1,2?，王立社1
（⒈西安地质矿产研究所,陕西 西安 710054;⒉西北大学地质系,陕西 西安 710069）
摘 要：对天山中西段古生代花岗岩锆石TIMS法U?Pb同位素定年表明，中天山托克逊南—库米什北侵入于奥陶纪可可乃克群中的碱长花岗岩形成时代为395.1±0.9 Ma，花岗闪长岩体形成于393.5±2.7 Ma，石英闪长岩体形成于327.3±0.9 Ma，斜长花岗岩体形成时代为424.1±1.1 Ma，揭示出中天山中段库米什地区的三期构造岩浆事件，分别相当于早志留世、中泥盆世和早石炭世。中天山哈希勒根大坂黑云母花岗岩形成于286.8±0.8 Ma。对伊犁石炭—二叠纪裂谷带中花岗侵入岩类的锆石TIMS法U-Pb同位素定年表明，霍城果子沟角闪花岗岩形成于351.9±1.6 Ma，昭苏煤矿花岗闪长岩体形成时代为348.4±0.8 Ma，新源则克台角闪辉长岩体形成于308.2±1.2 Ma。南天山巴音布鲁克地区侵入于巴音布鲁克群中的石英闪长岩体形成时代为446.8±1.2 Ma，独库公路南段库尔干道班14.6 km和15.2 km处的角闪斜长花岗岩体与黑云母花岗岩体分别形成于426.3±1.9 Ma和425.1±1.8 Ma。对花岗
岩的岩石地球化学研究表明，中天山托克逊南—库米什北志留—早泥盆世花岗岩为钙碱系列，轻稀土富集，微量元素洋脊花岗岩标准化具有Rb、Th、Ba富集，Ta、Nb亏损的分配型式，形成于火山弧环境；石炭—二叠纪花岗岩为钙碱系列，准铝—过铝质花岗岩，轻稀土富集程度较前者低，微量元素洋脊花岗岩标准化具有Rb、Th富集，Ba略亏损和高场强元素亏损的特点，形成于后碰撞（post-collision）构造环境。伊犁石炭—二叠纪裂谷带中石炭—二叠纪花岗岩为过铝质花岗岩，轻稀土富集，微量元素洋脊花岗岩标准化分配型式同样具有Rb、Th富集，Ba明显亏损和高场强元素亏损的特点，亦形成于后碰撞（post-collision）构造环境。南天山库尔干花岗岩为Al2O3含量高的钙碱性系列、过铝质花岗岩，稀土元素含量中等（157.89×10-6~81.81×10-6?），轻稀土富集，Eu负异常明显，微量元素洋脊花岗岩标准化呈现出K、Rb、Th、Ba富集和Nb、Ta、Zr、Hf高场强元素亏损的特点，其形成时代与天山古生代洋盆俯冲时限相当，为岛弧构造环境。依据Sr-Nd-Pb同位素回时计算结果，本次研究所取的花岗岩初始锶同位素比值高，介于0.704 35~0.709 82，εNd(t)值多小于零或为很低的正值, T2DM或TDM均远大于岩体形成年龄，δO18‰多大于10，个别为6.7，显示出古老壳源物质在花岗岩浆的形成过程中起了重要作用。同时，鉴于花岗岩的εNd(t)均在0左右变动，同样说明，新生地壳在花岗岩浆的形成过程中同样起着重要作用。花岗岩的εNd(t)值与前寒武纪岩石的εNd(t)对比研究表明，中天山库米什北志留纪斜长花岗岩体可能是中新元古界斜长角闪岩部分熔融的产物，而石炭—二叠纪花岗岩既有中新元古界片麻岩或片岩部分熔融生成，亦有新生地壳部分熔融受到古老地壳混染后岩浆结晶产物。伊犁石炭—二叠纪花岗岩和南天山库尔干志留纪花岗岩均显示出新生地壳部分熔融，并受古老地壳混染的Nd同位素信息。?
关键词：花岗岩；TIMS；U-Pb同位素定年；岩石地球化学；物质来源；天山中西段?
中图分类号：P588. 14；P595；P597. 3文献标识码： A
TIMS U-Pb isotopic dating and geochemical characteristics of Paleozoic granitic rocks from the middle?westernsection of Tianshan
XU Xue-yi1, MA Zhong-ping1,2?, XIA Zu-chun1, XIA Lin-qi1 LI Xiang-min1,2?, WANG Li-she1?
(1. Xian Institute of Geology and Mineral Resources, Xi’an , 710054;?2.Department of Geology, Northwest University, Xi’an 710069)
Abstract：The results of TIMS U-Pb isotopic dating for the Paleozoic granitic ro
cks from the Middle?Western Section of Tianshan show that, the ages of four granitic rock bodies, plagiogranite, alkali feldspar granite, granodiorite and quartz diorite, intruded into Ordovician Kekenaike Group distributing between Tuokeshun and Kumishi, Central Tianshan, are 424.1±1.1 Ma, 395.1±0.9 Ma, 393.2±1.4 Ma and 327.3±0.9 Ma, respectively, which reveal three stages of structure-magma events in middle section of Central Tianshan, occurred in Early Silurian, Middle Devonian and Early Carbonif
erous, respectively; the biotite granite from Haxilegendaban, Central Tiangshan, formed in 286.8±0.8 Ma; the granodiorite from Guozigou, Huocheng County, granodiorite from Zhaoshu coal mine, and bojite from Zheketai, Xinyuan County, all of which distribute in the Carboniferous to Permian rift belt of Yili, formed in 351.9±1.6 Ma, 348.4±0.8 Ma and 308.3±1.2 Ma, respectively. The hornblende?plagiogranite and biotite granite from the southern section of Du-ku Road, Kuergan, formed in 426.3±1.9 Ma and 425.1±1.8 Ma, respectively. The Silurian to Devonian granitic rocks distributing between Tuokeshun and Kumishi, Central Tianshan, are
Calc-alkaline series, enriched in LREE, Rb, Th and Ba, depleted in Ta and Nb on
the Ocean ridge granite?normalized trace elements diagram, and should form in volcanic arc setting; the Carboniferous to Permian granitic rocks are calc?alkaline or tholeiitic series and metaluminous?peraluminous rocks, characterized by slight enrichment in LREE, intensive enrichment in Rb and Th relative to HFSE and Ba,
should form in post?collision setting. The Carboniferous to Permian granitic rocks from Carboniferous to Permian rift belt are peraluminous, characterized by enrichment in LREE, Rb and Th, intensive depletion in Ba and HFSE, and also formed in post?collision setting. The granites from Kuergan, southern Tianshan, whose formation time correspond with the subduction time of Paleozoic ocean of Tianshan, are calc?alkalic peraluminous rocks with high Al2O3, distinct Eu negative abnormity, middle ∑REE contents (157.89×10-6?~81.81×10-6?), and characterized by enrichment in LILE (K, Rb, Th and Ba) relatively to HFSE (Nb,Ta, Zr and Hf) on the ORG?normalized trace elements diagram, which suggest they should form in island arc setting. According to the Sr-Nd-Pb isotope studies, high (87Sr/86Sr)t values (0.70435~0.70982), lowerεNd(t)? values (lower than 0 or very lower positive values), high T2DM? or TDM? (distinctly higher than the formation ages of rock bodies), highδO18?‰(mostly higher than 10, exceptional 6.7), of all these Paleozoic granitic rock from the Middle?Western Section of Tianshan in this study，indicate that the age?old continental crust take an important role for the formation of granitic magma. Meanwhile, considering the varying ofεNd(t) values of these granitic rocks around 0, the juvenile crust play an important role ,too, for the granitic magma formation. The comparing studies on theεNd(t) values of these granite and Precambrian rocks suggest that, the Silurian plagiogranite body from the north of kumishi, Central Tianshan, is likely to the partial melting products of the Mesoproterozoic-Neoproterozoic amphibolite; the Carboniferous?Permian granites probably derive from the partial melting of Mesoproterozoic?Neoproterozoic gneiss or schist, as well as from the magma originated from the juvenile crust partial melting contaminated by age?old crust. The Carboniferous?Permian granites from Yili and the Silurian granites from Kuergan, southern Tianshan, show the Nb isotopic signatures of magma from juvenile crust partial melting contaminated by age-old crust.?Key words： Granite; TIMS; U?Pb isotopic dating; Petrogeochemistry; Matter source; Midlle?western section of Tianshan.
文章编号：1009-6248(2006)01-0076-07
新疆北山南部地区石炭－二叠纪岩石地层单位厘定及沉积环境分析
校佩曦1，黄玉华1，王育习2，王兴安1，王升勤2
（1.西安地质矿产研究所，陕西 西安 710054；2.陕西地矿局，陕西 西安 710054）〖HK38〗摘 要：石炭－二叠纪地层在新疆北山南部地区分布较为广泛，总体为浅变质强变形的一套岩石，经重新厘定从老到新岩石地层单位有：早石炭世红柳园组，晚石炭世石板山组、胜利泉组和干泉组；早二叠世红柳河组，中二叠世骆驼沟组。其沉积环境经历了滨浅海相→浅海相、半深海相→海陆交互相，为两个较为完整的沉积旋回，沉积物颜色为紫红色夹灰绿色，陆源碎屑为成熟度较低的石英和长石，显示了氧化条件、近源、快速堆积特征，反映为陆内裂谷盆地性质。?
关键词：新疆北山南部地区；石炭－二叠纪；岩石地层单位；沉积环境?
中图分类号：P534.45 P534.46 文献标识码： A
Analysis of sedimentary environment and ascertainment of Carboniferous?Permian lithostratigraphic unit in south area of Beishan, Xinjiang
XIAO Pei-xi1，HUANG Yu-hua１，WANG Yu-xi２，?WANG Xing-an１，WANG Shen-qin２?
（１.Xi′an Institute of Geology and Mineral Resources, Xi′an 710054,China； ?
2.Geology and Mineral Bureau of Shaanxi, Xian 710054,China）?
Abstract： Carboniferous?Permian strata distribute widely in south area of Beis
han, Xinjiang, which is a suit of slight alterative and strong deformation rock in the mass. The lithostratigraphic unit from old to youth by ascertainment over again as follow: Early Carboniferous Hongliuyuan Formation, Late Carboniferous Shibanshan Formation, Shengliquan Formation and Ganquan Formation, Early Permian Hongliuhe Formation, Middle Permian Luotuogou Formation. Their sedimentary environments go through from seashore facies to shallow sea facies and from blue water facies to alternant sea-and-land facies. They are two quite integrated sedimentary gyration. The color of the sediment is that the mauve inserts the grayish green and the source
piece in the land is the quartz and feldspar for low maturity, which displayed the deposit characteristic of oxidation, anear sourse and celerity, reflected the basin nature of the rift valley in the land.?
Key words： Beishan area of Xinjiang; Carboniferous?Permian; lithostratigraphic unit; sedimentary environment
文章编号：1009-6248(2006)01-0083-06
甘肃北山北部红石山地区泥盆纪雀儿山群及古孢子化石组合基本特征
张 国 英
（甘肃省地质调查院，甘肃 兰州 ７３００００）
摘 要：在1∶25万红宝石幅（K47C002001）图幅中，雀儿山群分布于哈萨克斯坦板块南缘，红石山蛇绿混杂岩带以北地带的双沟山—雀儿山一带，为一套宏观色调为灰绿色中基性、中酸性火山岩及其火山碎屑岩夹碎屑岩和灰岩的岩石组合。碎屑岩及灰岩中含腕足、珊瑚、三叶虫、海百合茎等生物化石。其中：?Latonotoechia? cf ?latana?（Barrande）原产于波希来亚地区布拉格期。?Acrospivifer cobedanus varius Kaplun?见于哈萨克斯坦地区下泥盆统中上部和新疆的和布克赛尔组。?Eoschuchertella guangxiensis? Wang et Rong 原于广西郁江组上部六景段。该群形成于与岛弧有关的滨浅海环境，在区域上可与新疆大南湖组、头苏泉组及和布克赛尔组对比。该群形成时代为早—中泥盆世，年代地层为下—中泥盆统。?
关键词：北山；红石山：泥盆纪：雀儿山群： 地层特征
中图分类号：P534.44 文献标识码： A
Features of the strata for Dsvonint Que ershan group in Hongshishan area of Beishan′s the Northern Belt,Gansu
ZHANG Guo-ying
(Geological Survey of Gansu Province, Lanzhou,735000,China)
Abstract： Through 1:250000 geological mappingin in Hongbaoshi area, Queershan Group distributed in Shanggoushan?Queershan area,it being in the southem margin of Kazakstan Plate,to the southern ophiolitic mélange accunulation in Hongshishan. It consists of a set of celada intermediate?basic,intermediate?acidic volcanic rocks and volcanic?clasticrocks intercalating clastic rocks.There are Brachiopoda. Anchozoa. TrilobitaCrinoidea et al. fossils in the clastic rocks and Iimestone. Latontechia cf.Latana(Barrande) early formed in Boxilaiya region in Barrandeehoch. Acrospivifer cobedanus varius Kaplun have been discovesed in Kazakstan region in lower-Devonian and Hebukeser Formatino of Xinjiang.Eoschuchertella guargxiensis Wang et. Rong early formed in Yujiang Formation of Guangxi. This group formed in the littoral-shallow marine facies which related to the island arc.It can comhare with Dananhu Formation. Tousuquan Fomation and Hebukeser Formation of Xinjiang. It formed in early-middle Devonian. ?Key words： Beishan;Hongshishan;Devonian; Queershan Group;the feature of strata
文章编号：1009-6248(2006)01-0089-09
内蒙西部银根－额济纳中生代盆地群叠置类型与勘探领域
陈启林1，2?，卫平生２，杨占龙２，白云来2
（１.中国地质大学，北京100083；2.中国石油勘探开发研究院 西北分院，兰州 730020）摘 要：内蒙西部银根－额济纳盆地群是在前古生代基底上发育起来的中、新生代“叠置型
”盆地群。构造演化经历了三叠纪的热拱隆张阶段、早中侏罗世的初始裂谷盆地阶段、早白垩世的裂谷盆晚白垩世的引张坳陷阶段、第三纪到第四纪的陆内聚敛挤压阶段。主要形成了下白垩统半深湖相烃源岩，其次为中下侏罗统煤系烃源岩。根据构造层之间的叠置关系，可划分为完全叠置型、基本叠置型、迁移叠置型三种盆地（凹陷）类型。不同叠置类型盆地（凹陷）的烃源岩发育特征、各类圈闭发育特征不同，油气成藏条件差别较大，勘探方向和勘探领域不同。根据裂谷小湖盆的沉积发育特征，应围绕沉积“洼槽”中心的烃源岩开展近源勘探，分别指出了不同叠置型盆地（凹陷）的勘探领域：叠置型盆地（凹陷）主要以控盆断裂带的滚动背斜、缓坡带的岩性、地层不整合圈闭为主要勘探领域；基本叠置型盆地（凹陷）主要以中央断裂隆起构造带的断鼻、断块圈闭为主要勘探领域；迁移叠置型盆地（凹陷）主要以不整合圈闭和缓坡带的岩性圈闭为主要勘探领域。?
关键词：银根－额济纳盆地群；叠置型盆地类型；近源勘探；勘探领域?
中图分类号：TE132.1 文献标识码： A
Superposed basin types and Exploration Realms in Mesozoic of Yingen-Ejina Banner Basins in the West of Inner Mongolia
CHEN Qi-lin1,2?，WEI Ping-sheng2，YANG Zhan-long2， BAI Yun-lai2
(1.China Geology University, Beijing 100083; 2.Nortwest Institute of Geology, PetroChina, Lanzhou 730020)
Abstract： Yingen-Ejina Banner Basins in the west of Inner Mongolia is shown by superposition of Mesozoic and Cainozoic on basement of pre-Palaeozoic constitute
s. Its evolution of the tectonicsm include hump and fission in high temperature stage
in Triassic, initial rift valley devopment stage in the early and middle Jurassic, rift basin devopment stage in the early Cretaceous, open and sag stage in the later Cretaceous and convergent and extruding stage in continent from Tertiary to Quaternary. In these process of evolution, it deposited mainly hydrocarbon source rocks of lacustrine facies in the early Cretaceous and secondary coal measures source rocks in early-middle Jurassic. The basin can be divided into three types such as entire superposition, basic superposition and displaced superposition according to the superposition correlation among of the tectonic layers. The character of hydrocarbon source rocks and the development character of traps may be different by all types of superposition basin. And the difference of the hydrocarbon accumulation condition is great. The direction and realm of exploration are different too. We should make some exploration around the hydrocarbon source rocks in middle of sedimentation groove based on character of sediment development in small rift lake basin. The thesis pointed out the exploration realms of all types of superposition basin: The exploration realms of entire superposition basin are roll anticline of fracture zone controlling basin, lithologic trap and stratigraphic unconformity trap
on gentle slope zone. The exploration realms of basic superposition basin are flault nose and flault block trap of central fracture and ridgy zone. The exploration realms of displaced superposition basin are lithologic trap on gentle slope zone and stratigraphic unconformity trap.?
Key words：Yingen-Ejina Banner Basins Superposition Basin Exploration near
Source Rocks Exploration Realms
文章编号：1009-6248(2006)01-0098-07
青海省柴达木盆地察尔汗盐湖首采区钾镁盐矿床开发及老卤排放对液体钾矿的影响现状
郭新华，王春男，马明珠
(青海省地质调查院，青海西宁 810007)
摘要：察尔汗盐湖首采区钾矿床开发利用所产生的水氯镁石—俗称“老卤”，没有合理的排放和开发，使矿床KCl品位降低，其造成的危害是一个长久持续的过程，解决矿床开采过程中造成的矿床老化问题的根本途径是如何将老卤合理开发利用。?
关键词：首采区；环境地质问题；察尔汗?
中图分类号：P619.21?+1文献标识码： A
Influence on the Ore of Development of the Potash ?Ore and the Laolu Disposing in the First Mine Area ?of Qarhan Saline Lake， Qinghai
GUO Xin-hua，WANG Chun-nan，MA Min-zhu
(Qinghai Institute of Geological Survey，Xi′ning 810012，China)
Abstract： Because the bischofite，it′s called for the Laolu, resulted from the developmemt of the potash ore in the first mine area of the Qarhan saline lake haven′t been disposed and used retionaly,the grade of the potash ore deposit were redused.The endangering will be a course for lang.The key to resolve it is how to develop and use retionaly the Laolu.?
Key words： first mine area; problem of geo-environment;Qarhan
文章编号：1009-6248(2006)01-0105-10
缅甸D区块构造特征与油气储层评价
陈剑光1， 刘怀山2， 周 军1， 涂齐催2
(1? 中石化滇黔桂石油勘探局工程技术研究所, 云南 昆明 650233；?2?中国海洋大学地球探测与信息工程实验室，山东 青岛 266003)
摘 要：研究区D区块位于缅甸中部，包括钦敦凹陷北部和沙林凹陷南部，面积12 384 km?2。D区块以南分布有许多油田。其中，Letpanto油田紧临该区块，在D区块内还有许多人工井或油苗，是油气聚集的有利场所，勘探潜力很大。为了研究该区的勘探方向,笔者从区域构造和沉积演化入手,分析研究了该区的生油层、储层和盖层的沉积相带特征和有利的油气聚集带。其中,晚始新世巴当组是始新世地层中产油的储层,为区块主要生油岩系；中新世和渐新世砂岩为良好储层；渐新世尧河组泥岩为较好的盖层；晚中新世到早上新世之间形成的各类局部构造圈闭均可能成为油气聚集场所，展示了良好的油气远景。?
关键词：缅甸D区块；地质特征；构造演化；区带优选；油气前景?
中图分类号：TE321 文献标识码： A
Structural feature and oil & gas reservoir analysis of Block D, Myanmar
CHEN Jian-guang1，LIU Huai-shan2，ZHOU Jun1，TU Qi-cui2
(1. Engineering Technology Research Institute, Dian?Qian?Gui Petroleum ?
Exploration Bureau, CNPC, Kunming, Yunnan 650233, China；?2. Earth Exploration and Information Engineering Lab, Ocean University of China Qingdao, Shandong 266003, China)
Abstract： Block D is situated in central Myanmar. It occupies an area of 12,384 sq km, stretching from the north of Minbu Basin to the south of Chindwin Basin. Many oil fields are located to the south of Block D; among them is Letpando Oil Field, which lies right next to it. Further, many hand?dug wells and oil seeps exist in the area, which suggests the presence of a favorable oil & gas movement zone worthy of exploration. In order to study the next exploration efforts in the region, this paper examines closely the structural and sedimentary evolution of the area, with an emphasis on the characteristics of the oil-generated strata, sedimentary facies of reservoirs and cap rock, as well as the review of favorable oil & gas accumulation sites in the area. Middle-Late cretaceous Kabaw Formation and Early Eocene Laungshe Formation are the main oil-generating rock formations; good reservoirs are sandstones which include Miocene Letkat formation, Eocene Pondaung formation and Tilin formation. Main caprock is developed from Miocene Natma Formation, Eocene Yaw Formation and Tabin Formation. Late Miocene to Early Pliocene formed from various local structural traps makes them potential oil & gas accumulation sites. The paper concludes that the region presents good oil & gas potential. ?
Key words：Block D, Myanmar; Structural feature; Structural evolvement; favorabl
e zone selected; oil & gas potential
文章编号：1009-6248(2006)01-0115-06
镇江金矿矿石物质成分及成矿流体研究
迟广成，赵爱林
(沈阳地质矿产研究所，辽宁沈阳110032）
摘 要：通过对镇江金矿床矿石中载金矿物成分、金矿物种类、金成色、金矿物赋存状态和金矿物形态及粒度特征详细研究，认为镇江金矿成矿流体具低温浅成特征，成矿流体经历了硫过饱和、硫饱和及硫不饱和3个阶段，表明成矿复杂性及多世代性，金成矿流体中富硫、铁、硅、氧等元素。金矿物主要以包体金和晶隙金形式赋存在黄铁矿和石英载金矿物之中。?
关键词：镇江金矿床；矿石成分；成矿流体?
中图分类号：P618?51 文献标识码： A
Characters of Mineral Components and Mineralizing Fluid of Zhenjiang Gold Deposit, Liaoning
CHI Guang-cheng， ZHAO ai-lin?
(Shenyang Institute of Geology and Mineral Resources, CGS? Shenyang 110032,China)
Abstract： This paper discusses characters of mineral components and mineralizing fluid of Zhenjiang gold deposits in Liaoning?. It shows character of epithermal gold deposit that concludes features of gold?carrying mineral components, gold mineral species, fineness, occurrences, gold mineral shape and granularity.? There ware 3 evolvement stages of ore-forming fluid by sulfur supersaturated, sulfur saturated, and sulfur unsaturated supersaturated periods.? In generally, it was rich in sulfur,iron, silicon and oxygen in ore?forming fluid?. The main gold?carrying mineral is pyrite and quartz.? The gold is in the inclusion gold and crystal fissure gold residence in pyrite and quartz??
Key words： mineralogical compositions； mineralizing fluid； Zhenjiang gold deposit
