西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

张玉修

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西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

张玉修

文章导航 > 沉积学报 > 2006 > 24(2): 165-174

张玉修. 西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义[J]. 沉积学报, 2006, 24(2): 165-174.

引用本文:

张玉修. 西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义[J]. 沉积学报, 2006, 24(2): 165-174.

ZHANG Yuxiu. Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting[J]. Acta Sedimentologica Sinica, 2006, 24(2): 165-174.

Citation:

ZHANG Yuxiu. Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting[J]. Acta Sedimentologica Sinica, 2006, 24(2): 165-174.

张玉修. 西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义[J]. 沉积学报, 2006, 24(2): 165-174.

引用本文:

张玉修. 西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义[J]. 沉积学报, 2006, 24(2): 165-174.

ZHANG Yuxiu. Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting[J]. Acta Sedimentologica Sinica, 2006, 24(2): 165-174.

Citation:

ZHANG Yuxiu. Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting[J]. Acta Sedimentologica Sinica, 2006, 24(2): 165-174.

西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

张玉修

中国科学院边缘海地质重点实验室广州 510640

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张玉修

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文章访问数: 1989
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Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting

ZHANG Yuxiu

Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences, Guangzhou 510640

More Information

Corresponding author: ZHANG Yuxiu

摘要

摘要: 来自羌塘地体(33°-35°N, 85°-93°E)的154件中生界砂岩样品颗粒组分实验结果表明，羌塘地体中部中下三叠统砂岩(Q61±8F27±13L12±10, Qm59±8F28±13Lt13±9, Qp28±22Lvm72±22Lsm0±0)的物源区为复杂的再旋回造山带和陆块内部，大部分上三叠统砂岩(Q78±14F6±5L16±12, Qm77±15F6±5Lt17±12, Qp14±23Lvm34±37Lsm52±33)、下侏罗统砂岩(Q83±20F2±2L15±22, Qm79±23F2±2Lt19±24, Qp35±19Lvm0±0 Lsm65±19)、中侏罗统砂岩(Q69±22F6±6L24±25, Qm67±22F6±6Lt26±24, Qp14±22Lvm32±38Lsm54±38)和上侏罗统砂岩(Q80±17F6±4L14±17, Qm78±17F6±4Lt16±16, Qp17±23Lvm27±35Lsm56±34)的物源区以再旋回造山带为主，然而，南羌塘地体南缘的上三叠统以及北羌塘地体南缘的下侏罗统同时发育物源来自陆块内部的砂岩。整个中羌塘复背斜带砂岩颗粒中常含有不稳定重矿物及其它易风化铁镁矿物表明该地区有丰富的蛇绿岩残片，这预示着双湖缝合带沿整个中羌塘复背斜带展布，羌塘中部含蓝片岩变质杂岩体可能形成于中羌塘不规则大陆边缘的海湾处，而不是来自金沙江缝合带。中生代砂岩的颗粒组分及岩石学证据表明，中羌塘复背斜至少从早三叠世就因为造山隆升并遭剥蚀提供物源。上三叠统砂岩物源区为再旋回造山带，这表明这种挤压背景下不存在沿班公湖—怒江缝合带弧后扩张的伸展机制。
- 砂岩 /
- 中生代 /
- 羌塘 /
- 青藏高原 /
- 特提斯
Abstract: Onehundredandfiftyfour Mesozoic sandstone samples from the Qiangtang block (ca. 3３°~35°N, 85°~93°E) were conducted for analysis of detrital modes, in an attempt to evaluate their provenance and the type of tectonic setting in which they were deposited. The LowerMiddle Triassic sandstones (Q61±8F27±13L12±10, Qm59±8F28±13Lt13±9, Qp28±22Lvm72±22Lsm0±0) in central Qiangtang are characterized by complex derivations from both recycled orogen and continental block provenances. The most of the Upper Triassic (Q78±12F7±7L15±11, Qm77±12F7±7Lt16±11, Qp16±11Lvm30±35Lsm54±33), Lower Jurassic (Q83±20F2±2L15±22, Qm79±23F2±2Lt19±24, Qp35±19Lvm0±0 Lsm65±19), Middle Jurassic (Q69±22F6±6L24±25, Qm67±22F6±6Lt26±24, Qp14±22Lvm32±38Lsm54±38), and Upper Jurassic (Q80±17F6±4L14±17, Qm78±17F6±4Lt16±16, Qp17±23Lvm27±35Lsm56±34) sandstones are dominated by recycled orogen origin. However, the sandstones that were derived from continental block source also exist in the southern margin of southern Qiangtang and in the Lower Jurassic strata in the southern margin of northern Qiangtang. It could have contained abundant ophiolitic fragments and other readilydecomposed ferromagnesian minerals across the entire anticlinorium. These mafic minerals point to the presence of the Shuanghu suture along the entire central Qiangtang anticlinorium and the blueschistbearing metamorphic complexes in central Qiangtang could be accommodated in a largescale enclave in an irregular central Qiangtang continental margin. The distribution of Mesozoic recycled orogenderived sandstones on Qiangtang indicates a contraction background, supporting〖KG*2〗a tensile mechanism for backarc spreading along the BangongNujiang belt. 
- sandstone /
- Mesozoic /
- Qiangtang /
- Tibetan plateau /
- Tethys

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[1]	. 青藏高原北部新生代构造演化在柴达木盆地中的沉积记录 . 沉积学报, 2013, 31(05): 824-833.
[2]	赵俊峰. 鄂尔多斯盆地侏罗系直罗组砂岩发育特征 . 沉积学报, 2007, 25(4): 535-544.
[3]	朱迎堂方小敏高军平伊海生王世锋张伟林. 青藏高原南部乌郁盆地渐新世—上新世地层沉积相分析 . 沉积学报, 2006, 24(06): 775-782.
[4]	宋春晖, 孙淑荣, 方小敏, 孙东. 酒西盆地晚新生代沉积物重矿物分析与高原北部隆升 . 沉积学报, 2002, 20(4): 552-559.
[5]	李祥辉, 王成善, 吴瑞忠. 西藏中部拉萨地块古生代、中生代的超层序研究 . 沉积学报, 2002, 20(2): 179-187.
[6]	蔚远江, 孙景民, 朱庆忠, 杨兵, 申军山, 刘宪斌, 韩春明. 羌塘盆地查郎拉地区中生代岩相古地理初探 . 沉积学报, 2002, 20(2): 229-237.
[7]	李维锋, 王成善, 高振中, 彭德堂. 塔里木盆地库车坳陷中生代沉积演化 . 沉积学报, 2000, 18(4): 534-538.
[8]	王兴涛, 张庆石, 张吉, 周书欣, 李景伟. 青藏高原中生界白云岩特征研究及成因分析 . 沉积学报, 2000, 18(4): 555-559.
[9]	陈刚. 中生代鄂尔多斯盆地陆源碎屑成分及其构造属性 . 沉积学报, 1999, 17(3): 409-413.
[10]	和政军. 辽宁锦西地区中元古代-中生代砂岩构造背景的探讨 . 沉积学报, 1989, 7(2): 21-28.

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西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

张玉修

中国科学院边缘海地质重点实验室广州 510640

通讯作者: 张玉修

收稿日期: 1900-01-01
修回日期: 1900-01-01
刊出日期: 2006-04-10

关键词:

砂岩 /

中生代 /

羌塘 /

青藏高原 /

特提斯

摘要: 来自羌塘地体(33°-35°N, 85°-93°E)的154件中生界砂岩样品颗粒组分实验结果表明，羌塘地体中部中下三叠统砂岩(Q61±8F27±13L12±10, Qm59±8F28±13Lt13±9, Qp28±22Lvm72±22Lsm0±0)的物源区为复杂的再旋回造山带和陆块内部，大部分上三叠统砂岩(Q78±14F6±5L16±12, Qm77±15F6±5Lt17±12, Qp14±23Lvm34±37Lsm52±33)、下侏罗统砂岩(Q83±20F2±2L15±22, Qm79±23F2±2Lt19±24, Qp35±19Lvm0±0 Lsm65±19)、中侏罗统砂岩(Q69±22F6±6L24±25, Qm67±22F6±6Lt26±24, Qp14±22Lvm32±38Lsm54±38)和上侏罗统砂岩(Q80±17F6±4L14±17, Qm78±17F6±4Lt16±16, Qp17±23Lvm27±35Lsm56±34)的物源区以再旋回造山带为主，然而，南羌塘地体南缘的上三叠统以及北羌塘地体南缘的下侏罗统同时发育物源来自陆块内部的砂岩。整个中羌塘复背斜带砂岩颗粒中常含有不稳定重矿物及其它易风化铁镁矿物表明该地区有丰富的蛇绿岩残片，这预示着双湖缝合带沿整个中羌塘复背斜带展布，羌塘中部含蓝片岩变质杂岩体可能形成于中羌塘不规则大陆边缘的海湾处，而不是来自金沙江缝合带。中生代砂岩的颗粒组分及岩石学证据表明，中羌塘复背斜至少从早三叠世就因为造山隆升并遭剥蚀提供物源。上三叠统砂岩物源区为再旋回造山带，这表明这种挤压背景下不存在沿班公湖—怒江缝合带弧后扩张的伸展机制。

English Abstract

Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting

ZHANG Yuxiu

Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences, Guangzhou 510640

Corresponding author: ZHANG Yuxiu

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2006-04-10

Keywords:

Abstract: Onehundredandfiftyfour Mesozoic sandstone samples from the Qiangtang block (ca. 3３°~35°N, 85°~93°E) were conducted for analysis of detrital modes, in an attempt to evaluate their provenance and the type of tectonic setting in which they were deposited. The LowerMiddle Triassic sandstones (Q61±8F27±13L12±10, Qm59±8F28±13Lt13±9, Qp28±22Lvm72±22Lsm0±0) in central Qiangtang are characterized by complex derivations from both recycled orogen and continental block provenances. The most of the Upper Triassic (Q78±12F7±7L15±11, Qm77±12F7±7Lt16±11, Qp16±11Lvm30±35Lsm54±33), Lower Jurassic (Q83±20F2±2L15±22, Qm79±23F2±2Lt19±24, Qp35±19Lvm0±0 Lsm65±19), Middle Jurassic (Q69±22F6±6L24±25, Qm67±22F6±6Lt26±24, Qp14±22Lvm32±38Lsm54±38), and Upper Jurassic (Q80±17F6±4L14±17, Qm78±17F6±4Lt16±16, Qp17±23Lvm27±35Lsm56±34) sandstones are dominated by recycled orogen origin. However, the sandstones that were derived from continental block source also exist in the southern margin of southern Qiangtang and in the Lower Jurassic strata in the southern margin of northern Qiangtang. It could have contained abundant ophiolitic fragments and other readilydecomposed ferromagnesian minerals across the entire anticlinorium. These mafic minerals point to the presence of the Shuanghu suture along the entire central Qiangtang anticlinorium and the blueschistbearing metamorphic complexes in central Qiangtang could be accommodated in a largescale enclave in an irregular central Qiangtang continental margin. The distribution of Mesozoic recycled orogenderived sandstones on Qiangtang indicates a contraction background, supporting〖KG*2〗a tensile mechanism for backarc spreading along the BangongNujiang belt. 

张玉修. 西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义[J]. 沉积学报, 2006, 24(2): 165-174.

引用本文:

张玉修. 西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义[J]. 沉积学报, 2006, 24(2): 165-174.

ZHANG Yuxiu. Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting[J]. Acta Sedimentologica Sinica, 2006, 24(2): 165-174.

Citation:

ZHANG Yuxiu. Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting[J]. Acta Sedimentologica Sinica, 2006, 24(2): 165-174.

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西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

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张玉修

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Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting

Corresponding author: ZHANG Yuxiu

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西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

中国科学院边缘海地质重点实验室广州 510640

通讯作者: 张玉修

English Abstract

Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting

Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences, Guangzhou 510640

Corresponding author: ZHANG Yuxiu

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西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

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Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting

Corresponding author: ZHANG Yuxiu

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西藏羌塘地体三叠纪—侏罗纪海相砂岩颗粒组分及其构造意义

中国科学院边缘海地质重点实验室 广州 510640

通讯作者: 张玉修

English Abstract

Mesozoic Sandstone Composition in the Qiangtang Block, Tibet: Implications for Tectonic Setting

Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences, Guangzhou 510640

Corresponding author: ZHANG Yuxiu

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通讯作者:
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中国科学院边缘海地质重点实验室广州 510640