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科学通报  2014 

赣东北弋阳早古生代麻粒岩的发现及其地质意义

DOI: 10.1360/N972014-00395, PP. 3508-3516

Keywords: 赣东北,高级变质作用,早古生代,碰撞造山作用

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Abstract:

新发现于赣东北弋阳县南的麻粒岩是一个基性麻粒岩,具有石榴子石+斜长石+紫苏辉石+黑云母+磁铁矿的矿物组合,根据矿物成分变化和矿物的包含关系确定了峰前变质(M1)和峰期变质(M2).成岩格子和地质温压计计算限定了麻粒岩峰前变质的温压是830~870℃和~1.0GPa,而峰期的变质条件是850~900℃和0.7~0.8GPa,显示了一个近于等温降压的顺时针PTt轨迹.LA-ICPMS锆石U-Pb定年表明麻粒岩相变质作用发生在436Ma,而其原岩可能形成于新元古代早期.结合已有的发现,本文指出华夏地块内发生的早古生代(加里东期)高级变质作用与碰撞造山带作用有关,很可能是扬子地块与东冈瓦纳大陆挤压碰撞的结果.

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