赣东北万年地区万年群的建立及其意义
Establishment of the Wannian Group in the Wannian area,northeastern Jiangxi, China and its significance.
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摘要: 万年群是发育在江南复合混杂岩带中之赣东北进贤—万年地区的一套中元古代蓟县纪浅变质岩系。据其岩性组合、沉积环境等特征自下而上进一步划分为枫树岭组、牛头岭组、皮库组和程源组,岩石地球化学特征反映其大地构造环境为大陆岛弧—弧后盆地,其层位与弧后盆地之双桥山群安乐林组、修水组,溪口岩群,火山岛弧的双溪坞群和弧间盆地的张村群相当,但岩性组合差异甚大,属同时异相的产物。万年群的建立为华南中元古代地层的划分对比提供了新的思路。Abstract: The Wannian Group is a low- grade metamorphic series of the Mesoproterozoic Jixian Period in the Jinxian- Wanni- an area,northeastern Jiangxi,in the Jiangnan composite migmatite belt. According to its rock association and sedimentary envi- ronment,the group may be subdivided in ascending order into the Fengshuling Formation,Niutouling Formation,Piku For- mation and Chengyuan Formation. The rock geochemistry reflects that: its tectonic environment was the continental island arc- back- arc basin, and its horizon is equivalent to the Anlilin Formation, Xiushui Formation and Xikou Formation of the Shuangqiaoshan Group- complex, Shuangxiwu Group- complex of the volcanic arc and Zhangcun Group- complex of the back- arc basin but their rock associations are quite different,belonging to the synchronous and heteropic products. The estab- lishment of the Wannian Group provides a new idea for the stratigraphic division and correlation of the Mesoproterozoic strata in South China.
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Keywords:
- Wannian Group /
- Mesoproterozoic /
- stratigraphic correlation /
- Wannian area /
- northeastern Jiangxi
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