Spatial and temporal distribution of Mesozoic adakitic rocks along the Tan-Lu fault, Eastern China: Constraints on the initiation of lithospheric thinning
Spatial and temporal distribution of Mesozoic adakitic rocks along the Tan-Lu fault, Eastern China: Constraints on the initiation of lithospheric thinning
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中国东部郯庐断裂带中生代埃达克岩时空分布：岩石圈减薄起始的制约因素
DOI：
10.1016/j.lithos.2013.07.011
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发表时间：
2013-09
期刊：
影响因子：
3.5
通讯作者：
Hou, Zhenhui
中科院分区：
文献类型：
--
作者：
Li, Wang-Ye;Yang, Xiaoyong;Pack, Andreas;Hou, Zhenhui
中国东部中生代构造以华北克拉通岩石圈明显减薄、郯庐断裂大规模走滑运动和区域岩浆活动为特征，并伴有成矿作用。本文通过对山东郯庐断裂带中生代岩浆岩的地球化学、锆石年代学和全岩氧同位素的系统研究，探讨了这三次事件之间可能的联系。郯庐断裂带高镁达质岩的侵位年龄为134 ~ 128 Ma，具有明显的时空分布特征，表明这些侵入体的侵位受到强烈的构造控制，岩浆的生成可能与早白垩世太平洋板块的俯冲有关。苏鲁造山带低镁埃达克岩（127 ~ 120 Ma）的形成时间晚于高镁埃达克岩，而大别造山带大部分低镁埃达克岩（143 ~ 129 Ma）的形成时间早于高镁埃达克岩。根据现有资料，我们认为中生代郯庐断裂的大规模走滑构造在华北克拉通东南缘引发了克拉通破坏，并对断层附近的下陆壳产生了重大影响。这一过程导致地壳碎屑沉入软流圈，与橄榄岩发生反应，使埃达克质熔体的Mg#含量增加，形成高Mg埃达克质岩石。苏鲁造山带郯庐断裂下方重力不稳定的下陆地壳引发了较大的下陆地壳体积剥离或根部沉降。
The Mesozoic tectonics in East China is characterized by significant lithospheric thinning of the North China Craton, large-scale strike-slip movement along the Tan-Lu fault, and regional magmatism with associated metallogeny. Here we address the possible connections between these three events through a systematic investigation of the geochemistry, zircon geochronology and whole rock oxygen isotopes of the Mesozoic magmatic rocks distributed along the Tan-Lu fault in the Shandong province.The characteristic spatial and temporal distributions of high-Mg adakitic rocks along the Tan-Lu fault with emplacement ages of 134-128 Ma suggest a strong structural control for the emplacement of these intrusions, with magma generation possibly associated with the subduction of the Pacific plate in the early Cretaceous. The low-Mg adakitic rocks (127–120 Ma) in the Su-Lu orogenic belt were formed later than the high-Mg adakitic rocks, whereas in the Dabie orogenic belt, most of the low-Mg adakitic rocks (143-129 Ma) were generated earlier than the high-Mg adakitic rocks. Based on available data, we suggest that the large scale strike-slip tectonics of the Tan-Lu fault in the Mesozoic initiated cratonic destruction at the south-eastern margin of the North China Craton, significantly affecting the lower continental crust within areas near the fault. This process resulted in crustal fragments sinking into the asthenosphere and reacting with peridotites, which increased the Mg# of the adakitic melts, generating the high-Mg adakitic rocks. The gravitationally unstable lower continental crust below the Tan-Lu fault in the Su-Lu orogenic belt triggered larger volume delamination of the lower continental crust or foundering of the root.
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影响因子：
3.9
作者：
Jin-Hui Yang;Sun‐Lin Chung;S. Wilde;Fu-Yuan Wu;M. Chu;C. Lo;H. Fan
通讯作者：
Jin-Hui Yang;Sun‐Lin Chung;S. Wilde;Fu-Yuan Wu;M. Chu;C. Lo;H. Fan
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影响因子：
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作者：
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通讯作者：
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影响因子：
5.8
作者：
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通讯作者：
A. Draut;P. Clift
影响因子：
2.4
作者：
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通讯作者：
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影响因子：
3.5
作者：
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通讯作者：
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