扬子地块东南缘沉积岩的Nd同位素研究

周秦禧; 陈江峰; 张巽; 文东; 谢智; 徐祥; 邢凤鸣

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扬子地块东南缘沉积岩的Nd同位素研究

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣

文章导航 > 沉积学报 > 1995 > 13(3): 39-45

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣. 扬子地块东南缘沉积岩的Nd同位素研究[J]. 沉积学报, 1995, 13(3): 39-45.

引用本文:

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣. 扬子地块东南缘沉积岩的Nd同位素研究[J]. 沉积学报, 1995, 13(3): 39-45.

Zhou Taixi, Chen Jiangfeng, Zhang Xun, Wen Dong, Xie Zhi, Xu Xxiang, Xing Fengming. Nd Isotope Ratios of Sedimentary Rocks from the Southeastern Margin of Yangtze Block, China[J]. Acta Sedimentologica Sinica, 1995, 13(3): 39-45.

Citation:

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣. 扬子地块东南缘沉积岩的Nd同位素研究[J]. 沉积学报, 1995, 13(3): 39-45.

引用本文:

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣. 扬子地块东南缘沉积岩的Nd同位素研究[J]. 沉积学报, 1995, 13(3): 39-45.

Citation:

扬子地块东南缘沉积岩的Nd同位素研究

1 中国科学技术大学地球和空间科学系合肥 230026;
2 安徽省地质科学研究所合肥 230001

基金项目: 国家自然科学基金

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Nd Isotope Ratios of Sedimentary Rocks from the Southeastern Margin of Yangtze Block, China

1 Department of Earth and Space Science, University of Science and Technology of China, Hefei 230001;
2 Anhui Institute of Geological Sciences, Hefei 230001

摘要

摘要: 扬子地块东南缘上溪群分布区及其周边沉积岩的Ｎｄ同位素研究结果，支持存在一条苏浙皖古生代裂陷槽（或江南深断裂）的观点。上溪群以北直至长江边所分布的震旦系－古生代的盖层沉积岩，其Ｎｄ模式年龄有两组，表明物源区不同。裂陷槽以北，沉积岩的物源区为Ｎｄ模式年龄约２.０～２.１Ｇａ的扬子物源区；以南的沉积岩表现出明显的幔源物质混染，显示出元古代岩浆活动的影响，而上溪群分布区以南直到江绍断裂附近主要表现上溪物源区的影响，华夏地块古老基底岩石则无显著贡献。
- Nd同位素模式年龄 /
- 沉积物物源区 /
- 扬子地块东南缘
Abstract: From the study of Nd isotope geochemistry for low grade metamorphic rocks, covering strata sedimentary rochs and associated volcanic rocks occured in the distribution area of Proterozoic Shangxi Group (traditionally called the Jiangnan old land) and surroundings in the southeastern margin of Yangtze Block, it is shown that the Nd isotopic model ages of the Sinian to Permian sedimentary rocks in the north side and south side of Jiangnan Deep Fault (or called Su-Zhe-Wan Palaeozoic Aulacogrn), as well as low-grade metamorphic rocks of Shangxi Group are 1.9-2.IGa, 1.2-1.3Ga and 1.7Ga, respectivelly. Therefore, the provenances of the Sinian to Palaeozoic sedimentary rocks on hath sides of the Jiangnan hop Fault were different and the idea that the Jiangnan hop Fault was harrier for edment transportation is proved by Nd isotopic geochemical evidence.There is a distribution area of the Palaeozoic strata between the Shangxi Group area and Jiangshan-Shaoxing Fault adjacent to Cathaysia Block. The Nd model ages of 2 samples for the Sinian to Silurian sedimentary rocks are 1. 8- 1. 7Ga, but the Nd model age of the basement rocks in cathaysia Block is older, for example, the model age of 2.1-2.5Ga for Chencai Group. It is indicated that the sediment supplment for the area to the south of the Shangxi Group distribution area mainly comes from the low metamorphic rock of Shangxi Group, and the basement rocks in Cathaysia Block are not an important contributors. So that the provenance of sedimentary rocks over the area between Jiangnan Deep Fault and Jiangshao Fault is the distribution area of Shangxi Group and named "Shanxi Provenance". The sediment provenance for the north side of Jiangnan Deep Fault is a particular block in the north and named "Yangtze provenance".The Nd model ages of the Sinian eedimentary rocks in the Shangxi Group distribution area and its northern margin are 1.2-1.3Ga, lower than that of Shangxi Group. The andesitic volcanic rock of Puling Formation in the northern margin of the Shangxi Group area and its xenoliths also give lower Nd model age of 1.3-1.4Ga. The intermediate and acidic volcanic rocks of Jingtan Formation in the southern margin of Shangxi Group area give Nd model ages of 1.6-2.2 Ga.From the variation of Nd model age in space and time, it is deduced that there were an orogenic movement in late Proterozoic Era there and the effect of mantle materials on sediment supplement at that time.
- Nd isotopic model age /
- sedimentary provenances /
- Southeastern margin of Yangtze Block

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参考文献(1)

[1]

1.DePaolo D. J.，1988, Neodymium Isotope Geochemistry; An Introduction. Springer-Vetlag. Berlin, 76-80.

2.陈江峰等，1989.皖南浅变质岩和沉积岩的铰同位素组成及沉积物物源区，科学通报，39(20):1572 -1579。

3. Michard. A.，1985, Geochim. Casmochim. Acta. V. 49, p.601-610.

4.杨志坚，1981，地质论评，27(2):123-129。

5.Foland K. A. and Allen J. C.，1991，Coutrib. Mineral.Petrol. ; V. 109. P. 195-211.

6.胡雄健等，1991,浙西南前寒武纪地质，北京:地质出版社，3045。

7.许靖华等，1987，是华南造山带而不是攒南地台，中国科学B辑，(10);1107-1115。

8.Chen Jiangfeng, et al.，1991，Geology. V. 19, p.815一818.

9.邢凤鸣等，1993，长江中、下游早元古代基底的发现及意义，科学通报，38(20);1883- 1886。

10.杨巍然等，1993，壳慢演化与成岩成矿同位素地球化学，北京:地震出版社，89-90。

11.李曙光等，1992，中国东南海陆岩石圈结构与演化研究，北京:中国科学技术出版社，46-54。

12.李秀新等，1992，中国东南海陆岩石圈结构与演化研究，北京:中国科学技术出版社，32-95。

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扬子地块东南缘沉积岩的Nd同位素研究

1 中国科学技术大学地球和空间科学系合肥 230026;

2 安徽省地质科学研究所合肥 230001

基金项目: 国家自然科学基金

收稿日期: 1994-08-17
刊出日期: 1995-09-10

关键词:

Nd同位素模式年龄 /

沉积物物源区 /

扬子地块东南缘

摘要: 扬子地块东南缘上溪群分布区及其周边沉积岩的Ｎｄ同位素研究结果，支持存在一条苏浙皖古生代裂陷槽（或江南深断裂）的观点。上溪群以北直至长江边所分布的震旦系－古生代的盖层沉积岩，其Ｎｄ模式年龄有两组，表明物源区不同。裂陷槽以北，沉积岩的物源区为Ｎｄ模式年龄约２.０～２.１Ｇａ的扬子物源区；以南的沉积岩表现出明显的幔源物质混染，显示出元古代岩浆活动的影响，而上溪群分布区以南直到江绍断裂附近主要表现上溪物源区的影响，华夏地块古老基底岩石则无显著贡献。

English Abstract

Nd Isotope Ratios of Sedimentary Rocks from the Southeastern Margin of Yangtze Block, China

1 Department of Earth and Space Science, University of Science and Technology of China, Hefei 230001;

2 Anhui Institute of Geological Sciences, Hefei 230001

Received Date: 1994-08-17
Publish Date: 1995-09-10

Keywords:

Abstract: From the study of Nd isotope geochemistry for low grade metamorphic rocks, covering strata sedimentary rochs and associated volcanic rocks occured in the distribution area of Proterozoic Shangxi Group (traditionally called the Jiangnan old land) and surroundings in the southeastern margin of Yangtze Block, it is shown that the Nd isotopic model ages of the Sinian to Permian sedimentary rocks in the north side and south side of Jiangnan Deep Fault (or called Su-Zhe-Wan Palaeozoic Aulacogrn), as well as low-grade metamorphic rocks of Shangxi Group are 1.9-2.IGa, 1.2-1.3Ga and 1.7Ga, respectivelly. Therefore, the provenances of the Sinian to Palaeozoic sedimentary rocks on hath sides of the Jiangnan hop Fault were different and the idea that the Jiangnan hop Fault was harrier for edment transportation is proved by Nd isotopic geochemical evidence.There is a distribution area of the Palaeozoic strata between the Shangxi Group area and Jiangshan-Shaoxing Fault adjacent to Cathaysia Block. The Nd model ages of 2 samples for the Sinian to Silurian sedimentary rocks are 1. 8- 1. 7Ga, but the Nd model age of the basement rocks in cathaysia Block is older, for example, the model age of 2.1-2.5Ga for Chencai Group. It is indicated that the sediment supplment for the area to the south of the Shangxi Group distribution area mainly comes from the low metamorphic rock of Shangxi Group, and the basement rocks in Cathaysia Block are not an important contributors. So that the provenance of sedimentary rocks over the area between Jiangnan Deep Fault and Jiangshao Fault is the distribution area of Shangxi Group and named "Shanxi Provenance". The sediment provenance for the north side of Jiangnan Deep Fault is a particular block in the north and named "Yangtze provenance".The Nd model ages of the Sinian eedimentary rocks in the Shangxi Group distribution area and its northern margin are 1.2-1.3Ga, lower than that of Shangxi Group. The andesitic volcanic rock of Puling Formation in the northern margin of the Shangxi Group area and its xenoliths also give lower Nd model age of 1.3-1.4Ga. The intermediate and acidic volcanic rocks of Jingtan Formation in the southern margin of Shangxi Group area give Nd model ages of 1.6-2.2 Ga.From the variation of Nd model age in space and time, it is deduced that there were an orogenic movement in late Proterozoic Era there and the effect of mantle materials on sediment supplement at that time.

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣. 扬子地块东南缘沉积岩的Nd同位素研究[J]. 沉积学报, 1995, 13(3): 39-45.

引用本文:

周秦禧, 陈江峰, 张巽, 文东, 谢智, 徐祥, 邢凤鸣. 扬子地块东南缘沉积岩的Nd同位素研究[J]. 沉积学报, 1995, 13(3): 39-45.