吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (1): 139-153.doi: 10.13278/j.cnki.jjuese.201701113
崔建军1, 王艳红2, 郑光高1, 施炜1, 马立成1
Cui Jianjun1, Wang Yanhong2, Zheng Guanggao1, Shi Wei1, Ma Licheng1
摘要: 大悟杂岩位于大别山西段,主体为花岗质片麻岩。为了限定其形成与变形过程,本文综合运用锆石U-Pb法和白云母40Ar/39Ar法进行年代学研究。锆石U-Pb LA-ICP-MS法对这些花岗质片麻岩定年结果显示:锆石的Th/U值为0.79~4.29,属于典型的岩浆锆石特征;206Pb/238U的加权平均年龄为(810±63)Ma(n=12,MSWD=0.021),代表这些花岗质片麻岩的形成时代。大悟杂岩核部花岗质片麻岩的白云母坪年龄为(210.5±1.4)Ma,相应的等时线年龄为(211.6±2.5)Ma。这些新的研究结果支持以下两点认识:大悟杂岩中的花岗质片麻岩形成于新元古代,而不是白垩纪;这些前寒武纪岩石的构造抬升过程发生在三叠纪晚期(211 Ma)。由于西大别晚三叠世构造与高压-超高压变质岩的出露过程有关,因此,大悟杂岩的变形与高压-超高压变质岩的抬升之间的关系就成为一个耐人寻味的科学问题。同时,由于大悟杂岩中的多数构造面理和线理形成于区域高压-超高压变质作用之后,据此推断西大别三叠纪晚期的变形发生在造山晚期-后造山背景下,伴随着地壳和岩石圈的大规模伸展与减薄。
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