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华南侏罗纪构造体制转换:碎屑锆石U-Pb年代学证据

, PP. 580-591

Keywords: 锆石U-Pb年龄,物源,侏罗系,粤东盆地,构造转换,华南

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Abstract:

中生代时,华南经历了从古特提斯构造域到古太平洋构造域的转换,但对转折时限的认识还存在一些差异。此外,对粤东地区晚三叠世-早中侏罗世的大地构造属性和沉积背景的工作还很缺乏。对此,本文选取粤东地区出露的早-中侏罗世碎屑岩为研究对象,运用锆石U-Pb定年方法,探究华南中生代构造体制转折的时限和构造背景。碎屑锆石测年结果显示,早侏罗世的样品中普遍出现约250Ma的主要峰值年龄,而中侏罗世的样品则都显示约180Ma的主要峰值年龄。研究区早侏罗世的主要物源为印支期岩浆活动产物,可能主要来自华南的南部边缘;而中侏罗世的主要物源则可能来自南岭东段中生代火山岩。研究区碎屑沉积岩的碎屑锆石主要年龄峰值的转变,及其对应的物源区转变可能表明,华南在早侏罗世末期(约180Ma)即已经完成了从古特提斯构造域向古太平洋构造域的转变。其大地构造背景则相应地从前期总体的挤压转变为伸展作用,粤东盆地从晚三叠世-早侏罗世早期时受挤压叠合走滑作用的类前陆盆地转变为早侏罗世末期的伸展断陷盆地。

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