吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (4): 1039-1052.doi: 10.13278/j.cnki.jjuese.20180018
曾忠诚1,2, 边小卫1,2, 张若愚2, 孔文年1,2, 陈宁2, 赵端昌1,2, 赵江林1,2
Zeng Zhongcheng1,2, Bian Xiaowei1,2, Zhang Ruoyu2, Kong Wennian1,2, Chen Ning2, Zhao Duanchang1,2, Zhao Jianglin1,2
摘要: 新疆塔什库尔干地区下-中侏罗统龙山组,位于最新填绘的唐盖河-新迭村构造混杂岩带(康西瓦构造带)的南侧,总体为一套青灰色-灰色碳酸盐岩-碎屑岩沉积,主要以泥灰岩和杂砂岩为主,源区岩石没有经过充分的搬运、分选,成熟度比较低。稀土元素特征表现为轻稀土元素富集、重稀土元素相对平坦和Eu亏损明显的特征,与典型上地壳非常相似;而微量元素质量分数也接近于大陆上地壳值;说明下-中侏罗统龙山组物源来自上地壳。沉积环境综合分析表明,龙山组沉积环境为浅海陆棚-近滨-前滨环境,表现出进积特征,总体为一个海退序列,反映了寒冷干燥的气候条件下,海平面下降、残留海盆收缩的沉积构造环境。从物源区构造背景来看,龙山组以活动大陆边缘为主,兼具大陆岛弧性质。结合区域地质构造背景,龙山组为羌塘地块和昆仑地块拼合之后形成的残留洋边缘沉积,其主要物源来源于其北侧的康西瓦构造带。
中图分类号:
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