| 新疆库车坳陷中、新生界碳酸盐岩及其成因意义? |
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| 引用本文： | 贾进华.新疆库车坳陷中、新生界碳酸盐岩及其成因意义?[J].古地理学报,2002,4(4):30-38. |
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| 作者姓名： | 贾进华 |
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| 作者单位： | 中国石油勘探开发研究院 北京 100083 |
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| 基金项目： | 国家“九五”重点科技攻关项目 (991 1 1 0 1 0 2 0 5 )部分成果 |
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| 摘 要： | 新疆库车坳陷古近系库姆格列木群为与广海连通不畅的半封闭局限海湾-蒸发潟湖环境沉积，它应是新特提斯洋向北的延伸部分，其中的碳酸盐岩主要为海相蒸发潮坪环境的潮上带膏云坪，潮间带生屑滩、砂屑滩、鲕滩和潮下带泥晶灰岩、泥岩、泥晶云岩等。白垩系巴什基奇克组底部的灰黑色泥灰岩为深湖环境的沉积，分布较局限，仅见于克拉201井；白垩系巴什基奇克组中部的浅灰色透镜状泥灰岩结核是典型干旱陆上暴露环境的产物，仅在库车河剖面见零星分布。侏罗系湖相碳酸盐岩主要分布在恰克马克组，其次是阳霞组和克孜勒努尔组，在卡普沙良河剖面的恰克马克组上部，可见到大量的叠层石灰岩，它们主要形成于能量较强的浅湖环境；深灰色泥晶灰岩常与灰黑色泥岩伴生，是深湖-半深湖环境产物。以上这些不同时期不同沉积环境的碳酸盐岩具有不同规律的微量元素和碳、氧同位素特征，它们对于研究库车坳陷的沉积环境变迁和盆地演化具有重要意义。个别样品地球化学数据的偏差不能代表对整体沉积环境的判别，所以碳酸盐岩沉积环境的判别需要结合共生岩石沉积构造、沉积组合序列、古生物和沉积地球化学等资料进行综合分析。
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| 关 键 词： | 碳酸盐岩 沉积环境 沉积地球化学 中生界 新生界 库车坳陷 新疆 |
| 文章编号： | 1671-1505(2002)04-0030-09 |
| 修稿时间： | 2002年1月8日 |
CARBONATE ROCKS AND THEIR GENETIC SIGNIFICANCE OF THE MESOZOIC AND CENOZOIC IN KUQA DEPRESSION OF XINJIANG AREA |
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| Jia Jinhua Research Institute of Petroleum Exploration and Development,PetroChina,Beijing $$$$.CARBONATE ROCKS AND THEIR GENETIC SIGNIFICANCE OF THE MESOZOIC AND CENOZOIC IN KUQA DEPRESSION OF XINJIANG AREA[J].Journal of Palaeogeography,2002,4(4):30-38. |
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| Authors: | Jia Jinhua Research Institute of Petroleum Exploration and Development PetroChina Beijing $$$$ |
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| Institution: | Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 10008 |
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| Abstract: | Carbonate rocks are the most widespread deposits in the marine facies, and also distributed in the lacustrine and arid exposed environments. Carbonate rocks of Lower Paleogene Kumugeliemu Group in Kuqa Depression deposited in the typical tide flat of semi closed bay, a part of northern edge of Neo Tethys Ocean. These carbonate rocks include gypsiferous dolomites deposited in upper tidal flat, bioclastic limestones, bioarenitic limestones, oolites deposited in the mid tidal flat, micritic limestones, mudstones and micritic dolomites deposited in the lower tidal flat. Blackish lenticular marlites of the lower part of Cretaceous Bashijiqike Formation deposited in the deep lacustrine, localized merely in Well Kela 201. The grayish lenticular marlites of the middle part of Cretaceous Bashijiqike Formation were deposited in the arid exposed environment, merely distributed in Kuchehe section. Lacustrine carbonate facies mostly distributed in Qiakemake Formation and secondly in Yangxia Formation and Kezilenuer Formation. There developed stromatolitic limestones deposited in the high energic littoral lacustrine environment in the upper of Jurassic Qiakemake Formation in Kapushalianghe Section. Blackish micritic limestones frequently accreted with grayish mudstones. They were the results of deep to semi deep lacustrine environments. These carbonate rocks deposited in the different periods and different environments posses the various discinplinary characters of trace elements and carbon oxygen isotopes. It is important to interpret depositional environment variety and basin evolution for these carbonate rocks. The chemistry data's deviation from individual sample can not influence the interpretation of whole sedimentary environments. The depositional environments of the carbonate rocks should be distinguished by integrating sedimentary structures of associated rocks, sedimentary assemblages, paleontology, sedimentary geochemistry and etc. |
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| Keywords: | carbonate rocks depositional environment sedimentary geochemistry Mesozoic and Cenozoic Kuqa Depression Xinjiang |
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