| 西藏札达盆地上新统古格组和托林组的厘定与层序地层划分 |
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| 引用本文： | 朱大岗,孟宪刚,邵兆刚,杨朝斌,韩建恩,余佳,雷伟志,孟庆伟,吕荣平.西藏札达盆地上新统古格组和托林组的厘定与层序地层划分[J].地质通报,2007,26(8):984-995. |
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| 作者姓名： | 朱大岗 孟宪刚 邵兆刚 杨朝斌 韩建恩 余佳 雷伟志 孟庆伟 吕荣平 |
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| 作者单位： | 1. 中国地质科学院地质力学研究所,北京,100081
2. 西藏自治区国土资源厅,西藏,拉萨,850000 |
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| 基金项目： | 中国地质调查局区域地质调查项目;国家自然科学基金 |
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| 摘 要： | 根据札达盆地剖面中地层的接触关系、沉积旋回、沉积体系和岩相岩性特征,可将上新统河湖相地层划分为2个组、5个沉积相、8个岩段。古格组(N22g)一岩段为砾岩,属河流相沉积;二、三、五岩段以细碎屑岩为主,属浅湖相沉积;四岩段以含粘土质细碎屑岩为主,属深湖相沉积。托林组(N21t)一、二、三岩段为一套砾岩、含砾中粗粒钙质长石岩屑砂岩和中细粒砂岩的碎屑岩,为典型冲(洪)积扇沉积物。ESR法和古地磁法测年结果表明,古格组形成时代为上新世晚期(4.40～2.47Ma);托林组形成时代为上新世早期(5.44～4.40Ma)。札达盆地为一同生断陷盆地,在上新世时期的构造运动过程中,盆地演化经历了水进体系域—湖泊扩张体系域—湖泊收缩体系域3个发展阶段。
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| 关 键 词： | 上新世 河湖相沉积 层序地层 古格组和托林组 札达盆地 西藏 |
| 文章编号： | 1671-2552（2007）08-0984-12 |
| 收稿时间： | 4/6/2007 12:00:00 AM |
| 修稿时间： | 2007-05-30 |
Definition of the Pliocene Guge and Toling formations and sequence stratigraphic division in the Zanda basin, Tibet, China |
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| ZHU Da-gang.Definition of the Pliocene Guge and Toling formations and sequence stratigraphic division in the Zanda basin, Tibet, China[J].Geologcal Bulletin OF China,2007,26(8):984-995. |
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| Authors: | ZHU Da-gang |
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| Institution: | ZHU Da-gang,MENG Xian-gang,SHAO Zhao-gang,YANG Chao-bin,HAN Jian-en,YU Jia,LEI Wei-zhi,MENG Qing-wei,L(U) Rong-ping |
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| Abstract: | Based on the contact relationships, sedimentary cycles, sedimentary systems and lithofacies and lithologic characteristics of the stratigraphic section, the Pliocene fluvio-lacustrine sediments in Zanda basin are divided into 2 formations, 5 sedimentary facies and 8 lithologic members. The first lithologic member of the Guge Formation consists of conglomerate, belonging to fluvial deposits; the second, third and fifth members are dominated by fine clastic rocks, belonging to shallow lacustrine deposits; and the fourth member consists predominantly of clayey fine clastic rocks, belonging to deep lacustrine sediments. The first, second and third members of the Toling Formation consist of a sequence of clastic rocks including conglomerate, pebbly and coarse- and medium-grained, calcareous feldspathic litharenite and medium and fine sandstone, belonging to typical alluvial (diluvial) fan deposits. ESR and paleomagnetic dating indicate that the age of the fluvio-lacustrine sediments of the Guge Formation is late Pliocene (4.40-2.47 Ma) and the age of the Toling Formation is early Pliocene (5.44-4.40 Ma) in the Zanda basin. The Zanda basin is a syngenetic downfaulted basin. Its evolution progressed through three stages: the transgressive systems tract, lake expansion systems tract and lake shrinkage systems tract during the Pliocene tectonic movement. |
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| Keywords: | Pliocene fluvio-lacustrine sediments sequence stratigraphy Guge and Toling formations Zanda basin Tibet |
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