扬子陆块庙湾蛇绿岩中橄榄岩的同位素年代学及其构造意义

邱啸飞; 杨红梅; 张利国; 赵小明; 段桂玲; 卢山松; 谭娟娟; 施念

doi:10.3799/dqkx.2015.094

Volume 40 Issue 7

Jul. 2015

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Article Navigation > Earth Science > 2015 > 40(7): 1121-1128

Qiu Xiaofei, Yang Hongmei, Zhang Liguo, Zhao Xiaoming, Duan Guiling, Lu Shansong, Tan Juanjuan, Shi Nian, 2015. Geochronology of Serpentinized Harzburgite in Miaowan Ophiolite, Yangtze Block and Its Tectonic Implications. Earth Science, 40(7): 1121-1128. doi: 10.3799/dqkx.2015.094

Citation:

Qiu Xiaofei, Yang Hongmei, Zhang Liguo, Zhao Xiaoming, Duan Guiling, Lu Shansong, Tan Juanjuan, Shi Nian, 2015. Geochronology of Serpentinized Harzburgite in Miaowan Ophiolite, Yangtze Block and Its Tectonic Implications. Earth Science, 40(7): 1121-1128. doi: 10.3799/dqkx.2015.094

Citation:

Qiu Xiaofei, Yang Hongmei, Zhang Liguo, Zhao Xiaoming, Duan Guiling, Lu Shansong, Tan Juanjuan, Shi Nian, 2015. Geochronology of Serpentinized Harzburgite in Miaowan Ophiolite, Yangtze Block and Its Tectonic Implications. Earth Science, 40(7): 1121-1128. doi: 10.3799/dqkx.2015.094

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Geochronology of Serpentinized Harzburgite in Miaowan Ophiolite, Yangtze Block and Its Tectonic Implications

doi: 10.3799/dqkx.2015.094

1.
Wuhan Center of China Geological Survey, Wuhan 430205, China
2.
Research Center of Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey, Wuhan 430205, China

Received Date: 2014-10-22
Publish Date: 2015-07-15

Abstract

Abstract

A series of strongly-deformed mafic-ultramafic rocks occur at the Kongling high-grade metamorphic terrain in Yangtze continental nucleus, scattering in the Miaowan Formation in layers and podiforms. This metamafic-ultramafic rock association is of great significance to the early tectonic evolution of Yantgze block. In this study, ID-TIMS whole-rock Sm-Nd isochron dating is carried out for the serpentinized harzburgite and amphibolite from this rock suite. The results indicate that the serpentinized harzburgite was formed at 1063±12Ma, showing that it is feasible to date tiny amount of heavily-altered ultramafic rocks by means of the Sm-Nd isotopic system. The comparatively uniform Nd isotopic composition (with ε_Nd(t) value ranging from 6.90 to 7.32) indicates that they were formed in a closed system. Two-stage Nd modal age of 1.13-1.09Ga is close to their emplacement time, implying an origin of partial melting from depleted asthenospheric mantle. Combined with documented work on late Mesoproterozoic to early Neoproterozoic tectonic-magmatic events in the area, it is suggested that the Yangtze block may have been composed of several microcontinents at that time. There could have been an ocean separating the Yangtze continental nucleus from western Yangtze continental segment.
- Yangtze continental nucleus,
- Miaowan ophiolite,
- Sm-Nd isochron,
- isotope,
- geochronology,
- petrology,
- geochemistry

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References(34)

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