Mafic dyke swarms is a special geologic terrain in continent,which can provide us abundant geodynamic information,mafic dyke swarms were an important symbol of the lithospheric extension,which were mainly derived
On the southeast coast of Fujian and its adjacent area, the NE-trending Changle-Zhao′an fault zone and several NW-trending faults that are genetically related to the former are well developed. With micro-relief analy...On the southeast coast of Fujian and its adjacent area, the NE-trending Changle-Zhao′an fault zone and several NW-trending faults that are genetically related to the former are well developed. With micro-relief analysis, the paper deals with the Quaternary activity of the faults and the tectonic stress field since the late Pleistocene in this region. The results indicate that the micro-relief of the NE-trending Changle-Zhao′an fault zone and the genetically related NW-trending faults is characterized by vertical and horizontal movements since the Quaternary; the faults in the region have undergone two active stages since the Quaternary, i.e. early Quaternary and late Pleistocene; since the late Pleistocene, the movement of the NE-trending faults showed a right-lateral strike-slip, while that of NW-trending faults a left-lateral strike-slip, indicating a NWW-SEE oriented horizontal principal stress of the regional tectonic stress展开更多
基金supported by National Natural Science Foundation of China grants(41073027)Supported by the Fundamental Research Funds for the Central Universities (2013G2271018)the State Key Laboratory of Ore Deposit Geochemistry (2009011)
文摘Mafic dyke swarms is a special geologic terrain in continent,which can provide us abundant geodynamic information,mafic dyke swarms were an important symbol of the lithospheric extension,which were mainly derived
文摘On the southeast coast of Fujian and its adjacent area, the NE-trending Changle-Zhao′an fault zone and several NW-trending faults that are genetically related to the former are well developed. With micro-relief analysis, the paper deals with the Quaternary activity of the faults and the tectonic stress field since the late Pleistocene in this region. The results indicate that the micro-relief of the NE-trending Changle-Zhao′an fault zone and the genetically related NW-trending faults is characterized by vertical and horizontal movements since the Quaternary; the faults in the region have undergone two active stages since the Quaternary, i.e. early Quaternary and late Pleistocene; since the late Pleistocene, the movement of the NE-trending faults showed a right-lateral strike-slip, while that of NW-trending faults a left-lateral strike-slip, indicating a NWW-SEE oriented horizontal principal stress of the regional tectonic stress
文摘对闽南沿海兄弟屿西南部的侵入岩开展了LA-ICP-MS锆石U-Pb年代学及全岩地球化学研究,获得2组锆石^(206)Pb/^(238)U加权平均年龄,其中(241±3.6) Ma为岩体侵入年龄(印支期),(141±5.1) Ma可能为后期热液事件年龄(燕山期)。岩石属高钾钙碱性弱过铝质花岗岩,轻、重稀土分馏程度强烈,具有中强的Eu负异常(δ Eu 0.39~0.45)和富集大离子亲石元素特征,显示S型花岗岩。其构造背景可能与古太平洋板块及滨海断裂带等活动有关,兄弟屿的侵入岩体发现为该地区构造-岩浆演化提供新的时空约束信息。