Geochronology and geochemistry of Early Mesoproterozoic meta-diabase sills from Quruqtagh in the northeastern Tarim Craton: Implications for breakup of the Columbia supercontinent
Geochronology and geochemistry of Early Mesoproterozoic meta-diabase sills from Quruqtagh in the northeastern Tarim Craton: Implications for breakup of the Columbia supercontinent
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塔里木克拉通东北部库鲁克塔赫早中元古代变辉绿岩基岩年代学和地球化学：对哥伦比亚超大陆分裂的启示
DOI：
10.1016/j.precamres.2013.11.007
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发表时间：
2014-02
影响因子：
3.8
通讯作者：
Gu Lian-Xing
中科院分区：
文献类型：
--
作者：
Lei Ru-Xiong;Dong Lian-Hui;Qu Xun;Gu Lian-Xing
变辉绿岩床广泛分布于塔里木克拉通东北部库鲁塔格地块中部的阿斯廷布拉克地区。本文报道了这些中元古代岩床的激光烧蚀-电感耦合等离子体质谱(LA-ICPMS)锆石U-Pb年龄和Hf同位素，以及全岩元素和锶-钕同位素数据。其中一个镁铁质岩床中的锆石获得了1470 Ma±9.9 Ma(95%置信度，MSWD=33.2，n=0.23)的侵位年龄。尽管有绿片岩-角闪岩相变质作用，但大多数不动元素为这些岩石的岩石成因和构造环境提供了重要线索。除流体活动性元素含量变化外，所有样品均富含不相容的微量元素，没有明显的Nb-Ta亏损，与大陆泛滥玄武岩和洋岛玄武岩的特征相似。结合其相对较高的87Sr/86Sr(T)值(0.70666~0.70784)、负ɛNd(T)值(−4.30~−3.96)和ɛHf(T)值(−5.49~−1.13)，推测原石器时代岩浆来源于大陆裂谷背景下富集地幔的高度部分熔融。塔里木北部∼_(1.5)Ga辉绿岩床对应于中元古代早期镁铁质岩浆活动的主幕，与劳伦西亚、西伯利亚、大刚果和南中国的其他地壳碎片相区别，可能属于与中元古代哥伦比亚超大陆解体有关的三大火成岩省之一。我们的数据对哥伦比亚超大陆内塔里木克拉通的形态提供了重要的限制
Metadiabase sills are extensively distributed in the Astingbulake region in the central Quruqtagh block of the NE Tarim Craton. Here we report laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U–Pb ages and Hf isotopes, as well as whole rock elemental and Sr–Nd isotopic data for these Mesoproterozoic sills. Zircons from one of the mafic sills yield an emplacement age of 1470 ± 9 Ma (95% confidence, MSWD = 3.2,n= 23) Ma. Despite the greenschist-amphibolite facies metamorphism, most of the immobile elements provide important clues for the petrogenesis and tectonic settings of these rocks. Except for their variable fluid mobile-element contents, all the studied samples show enrichment in incompatible trace elements with no obvious Nb–Ta depletion, similar to the features of continental flood basalts and ocean island basalts (OIB). Combined with their relative higher87Sr/86Sr (t) ratios (0.70666 to 0.70784), negative ɛNd(t) (−4.30 to −3.96) and ɛHf (t) (−5.49 to −1.13) values, we propose that the protolithic magmas were derived from the high degree partial melting of enriched continental lithospheric mantle within continental rifting settings. The ∼1.5 Ga diabase sills from North Tarim corresponded to the major episode of mafic magmatism during Early Mesoproterozoic time identified from other crustal fragments of Laurentia, Siberia, Greater Congo and South China, and probably belong to one of the three major large igneous provinces associated with the breakup of the Mesoproterozoic Columbia supercontinent. Our data provide important constraints on the configuration of the Tarim Craton within the Columbia supercontinent
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影响因子：
5
作者：
Hoskin, PWO
通讯作者：
Hoskin, PWO
影响因子：
2.6
作者：
Guochun Zhao;San-zhong Li;M. Sun;S. Wilde
通讯作者：
Guochun Zhao;San-zhong Li;M. Sun;S. Wilde
影响因子：
3.5
作者：
E. Aldanmaz;N. Köprübaşı;Ö. F. Gürer;Nuretdin Kaymakçi;A. Gourgaud
通讯作者：
E. Aldanmaz;N. Köprübaşı;Ö. F. Gürer;Nuretdin Kaymakçi;A. Gourgaud
影响因子：
3.5
作者：
S. Pisarevsky;T. K. Biswal;Xuan‐Ce Wang;B. Waele;R. Ernst;U. Söderlund;J. Tait;Kamleshwar Ratre;Y. K. Singh;Mads Cleve
通讯作者：
S. Pisarevsky;T. K. Biswal;Xuan‐Ce Wang;B. Waele;R. Ernst;U. Söderlund;J. Tait;Kamleshwar Ratre;Y. K. Singh;Mads Cleve
影响因子：
8.9
作者：
G. M. Young
通讯作者：
G. M. Young