中国东南部晚中生代花岗岩成因与深部动力学机制——古太平洋板块反复俯冲-后退模式
发布时间：2018-11-18 11:25
【摘要】：中国东南部晚中生代构造-岩浆活动强烈,花岗岩广泛分布。笔者近几年在赣南和闽西北鉴别出一系列早侏罗世镁铁质岩石和A型花岗岩,其中A型花岗岩呈北东向展布,构成一条早侏罗世A型花岗岩带。结合前人研究成果发现,中国东南部还存在另外3条A型花岗岩带,分别为晚侏罗世、早白垩世和晚白垩世A型花岗岩带,它们与早侏罗世A型花岗岩带一样均呈北东向展布,平行于现今海岸线,其中晚侏罗世A型花岗岩带更靠内陆一侧,早白垩世A型花岗岩带几乎与早侏罗世A型花岗岩带重叠,晚白垩世A型花岗岩带则分布于沿海地区。通过镁铁质和花岗质岩石成因综合研究,认为中国东南部晚中生代构造-岩浆活动可用古太平洋板块反复俯冲-后退模式来解释。
[Abstract]:Late Mesozoic tectonic-magmatic activity was strong in southeastern China and granites were widely distributed. In recent years, a series of early Jurassic mafic rocks and A-type granites have been identified in south Jiangxi and northwestern Fujian, in which A-type granites are distributed in the north east direction, forming an early Jurassic A-type granite belt. Combined with previous studies, it is found that there are three other A-type granite belts in southeastern China, which are late Jurassic, early Cretaceous and late Cretaceous A-type granite belts. Parallel to the present shoreline, the late Jurassic A-type granite belt is closer to the inland side, the early Cretaceous A-type granite belt almost overlaps with the early Jurassic A-type granite belt, and the late Cretaceous A-type granite belt is distributed in the coastal area. Based on a comprehensive study of the genesis of mafic and granitic rocks, it is considered that the late Mesozoic tectonic-magmatic activity in southeastern China can be explained by the repeated subduction and retrogression model of the paleo-Pacific plate.
【作者单位】： 南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室;
【基金】：国家自然科学基金项目(41272083) 国家重点基础研究发展计划项目(2012CB416706)
【分类号】：P588.121;P542
[Abstract]:Late Mesozoic tectonic-magmatic activity was strong in southeastern China and granites were widely distributed. In recent years, a series of early Jurassic mafic rocks and A-type granites have been identified in south Jiangxi and northwestern Fujian, in which A-type granites are distributed in the north east direction, forming an early Jurassic A-type granite belt. Combined with previous studies, it is found that there are three other A-type granite belts in southeastern China, which are late Jurassic, early Cretaceous and late Cretaceous A-type granite belts. Parallel to the present shoreline, the late Jurassic A-type granite belt is closer to the inland side, the early Cretaceous A-type granite belt almost overlaps with the early Jurassic A-type granite belt, and the late Cretaceous A-type granite belt is distributed in the coastal area. Based on a comprehensive study of the genesis of mafic and granitic rocks, it is considered that the late Mesozoic tectonic-magmatic activity in southeastern China can be explained by the repeated subduction and retrogression model of the paleo-Pacific plate.
【作者单位】： 南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室;
【基金】：国家自然科学基金项目(41272083) 国家重点基础研究发展计划项目(2012CB416706)
【分类号】：P588.121;P542
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