柴东北缘上古生界砂砾岩碎屑组分特征及其物源构造属性

孙娇鹏; 陈世悦; 庄毓凯; 刘金; 胡忠亚; 马帅

柴东北缘上古生界砂砾岩碎屑组分特征及其物源构造属性

1.
中国石油大学(华东)地球科学与技术学院, 山东青岛 266580
2.
江苏油田试采一厂, 江苏扬州 225400

基金项目:

国土资源地调项目 [2014]03-025-002;1212011120964-02

详细信息

作者简介:
孙娇鹏(1988-), 男, 博士研究生, 从事大地构造与沉积古地理研究。E-mail:sunjiaopeng@163.com

中图分类号: TE121.3
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出版历程
- 收稿日期: 2015-03-24
- 刊出日期: 2015-12-28

THE CLASTIC COMPOSITION CHARACTERISTICS OF UPPER PALAEOZOIC GLUTENITE IN NORTHEAST QAIDAM EDGE AND THE STRUCTURAL ATTRIBUTES OF SOURCE AREA

1.
China University Of Petroleum, School Of Geosciences, Qingdao 266555, Shandong, China
2.
Sinopec Jiangsu Oilfield Plant one, Yangzhou 225400, Jiangsu, China

摘要

摘要: 基于柴东北缘德令哈地区上古生界126件碎屑岩样品的镜下鉴定, 结合对牦牛山组、城墙沟组、怀头他拉组、克鲁克组及扎布萨尕秀组砂砾岩岩石学特征、沉积特征的野外调查, 研究柴达木东北部地区晚古生代碎屑岩物源区, 并在此基础上进一步讨论该地区晚古生代盆山格局。研究结果表明, 柴东北缘德令哈地区晚古生代主要发育扇三角洲-障壁海岸沉积体系, 砂砾岩碎屑颗粒结构成熟度较低, 重力流证据普遍存在; 各层段砂砾岩碎屑颗粒中Q/(R+F)值在1.89~3.74之间, 呈现低成分成熟度特点。碎屑颗粒组成及近物源沉积证据一致表明, 研究区晚古生代以鱼卡-沙柳河加里东期造山带为主要物源区。该造山带至少存在了195 Ma, 包括距今465~430 Ma的山体隆升与距今430~270 Ma的山体剥蚀阶段。柴达木海盆与德令哈海盆是两个独立的海盆, 发育展布方向完全相反的沉积体系。同时, 德令哈地区上古生界含油气系统勘探应将鱼卡河-沙柳河高压-超高压变质带视为勘探边界。
- 晚古生代 /
- 碎屑颗粒组分 /
- 物源分析 /
- 鱼卡-沙柳河造山带 /
- 构造属性
Abstract: Combining the microscopic analysis of one hundred and twenty-six clastic rock samples from the Upper Paleozoic in Delingha region with the petrology and sedimentology features of Maoniushan formation, Chengqianggou formation, Huaitoutala formation, Keruk formation and Zhabugaxiu formation, we concluded the provenance of the Upper Palaeozoic clastic rocks in Northeast Qaidam edge and made further discussion on the basin-mountain framework in this area. The resluts showed that fan dalta-beach barrier sedimentary system widely developed in Delingha region, the northeastern margin of Qaidam basin. The texture maturity sandstone of glutenite was low and the gravity flow was widespread with obvious evidence. The value of Q/(R+F) in each gravel layer was between 1.89 and 3.74, reflecting the low texture maturity. The clastic composition and the near-source sedimentary evidence consistently showed that the Yuka-Shaliuhe Caledonian orogenic belt was the provenance of the study area in Late Paleozoic which existed at least 195 Ma, including the uplift stage from 465 Ma to 430 Ma ago and the denudation stage between 430 Ma and 270 Ma ago. Qaidam basin and Delingha basin are two independent basin, with depositional system of opposite direction distribution. The Yuka-Shaliuhe HP-UHP metamorphic belt should be the exploration border of the Upper Paleozoic petroleum system in Delingha region.
- Late Paleozoic /
- clastic particles /
- provenance analysis /
- Yuka-Shaliuhe tectonic belt /
- structure attribute

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图 1 柴北缘地层-构造简图(据文献[4~7]修编)

Figure 1. Sketch stratum-geological map of northern Qaidam

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图 2 柴达木盆地东北缘地质简图(据文献[4]简化)

Figure 2. Geological sketch map of northeastern Qaidam basin

下载: 全尺寸图片幻灯片

图 3 柴北缘上古生界砂岩碎屑中石英(Qt)、长石(F)和岩屑(L)含量三角图以及柴北缘上古生界可能的物源区(据文献[1]修改)

Figure 3. The Qt-F-L triangle plot of 126 Upper Paleozoic sandstone samples and the potential provenance in northern Qaidam

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图 4 德令哈地区上古生界砂岩碎屑组分含量纵向变化

Figure 4. The vertical clastic composition change of the Upper Paleozoic sandstones in Delingha area

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图 5 德令哈地区上古生界碎屑岩镜下照片

Figure 5. Micrograph of the Upper Paleozoic clastic rocks in Delingha area

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图 6 德令哈地区上古生界砂砾岩重力流沉积证据

a—牦牛山剖面牦牛山组冲积扇沉积中的片岩砾石；b—城墙沟剖面城墙沟组扇三角洲相细砾岩；c—城墙沟剖面怀头他拉组扇三角洲相细砾岩；d—ZK1-1井克鲁克组扇三角洲砾岩沉积

Figure 6. Evidence of Upper Palaeozoic glutenite gravity flow deposits in Delingha area

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图 7 柴北缘地区晚古生代构造-古地理剖面简图^[1]

Figure 7. The paleostructure-paleogeographic sketch map of Late Paleozoic in northern Qaidam

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表 1 德令哈地区上古生界砂岩碎屑组分平均含量

Table 1. The average detrial composition of Upper Paleozoic in Delingha area

地层	碎屑组分平均含量/%
地层	石英	长石	岩屑	岩浆岩岩屑	沉积岩岩屑	变质岩岩屑
牦牛山组	62.1	12.5	20.3	12.0	4.7	4.1
城墙沟组	68.3	20.4	8.5	1.5	4.9	2.9
怀头他拉组	63.3	18.2	14.4	1.2	6.5	6.7
克鲁克组	72.5	9.6	15.1	1.3	6.5	6.5
扎布萨尕秀组	76.1	7.6	13.5	5.3	1.9	6.3

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