摘要
山东省蒙阴县常马韧性剪切带构造岩具有明显的分带 ,由中心向两侧依次为超糜棱岩带、糜棱岩带、初糜棱岩带和糜棱岩化片麻岩带。构造岩中的韧性变形显微组构极为发育。糜棱叶理产状为 2 0 8°∠ 74°,线理产状为 115°∠ 2°,显示了该韧性剪切带具走滑剪切的特征。该韧性剪切带形成时 ,差应力值为 5 2 .6 7MPa ,形成时古应力方位为σ1=73°∠ 2°。位于该韧性剪切带中心的超糜棱岩带 ,金元素明显富集 ,构成金矿体。综合研究表明 ,韧性剪切作用控制了金矿体的形成与分布 。
A strike-slip ductile shear zone occurs in Changma area in Mengyin County, Shandong Province. Four tectonic rock zones can be idetified from the center to outside wall rocks of the strike-slip ductile shear zone, i.e. ultramylonite zone, mylonite zone, protomylonite zone and mylonized gnesis zone respectively. Ductile alteration featues both of tectonic rocks and micro-fabrics of them are well developed. The occurrence of mylonite foliation is 208°∠74°, the occurrence of lineation is 115°∠2°. Stress analysis shows that the difference stress value was 52.67 MPa and the palaeo-stress orientation( σ 1) was 73°∠2°, when ductile shear zone formed. Gold mineralization occurs at the central part of the ductile shear zone and forms gold ore bodies. A comprehensive study indicates that the strike slip ductile shearing progress controlled the distribution and occurrence of gold ore bodies. The Changma gold deposit is a syn-ductile shearing gold deposit.
出处
《地质与勘探》
CAS
CSCD
北大核心
2001年第1期15-19,共5页
Geology and Exploration
基金
中国科学院创新工程项目!(KZCX1-Y -0 3-0 1)
重大项目!(KZ95 1-A1-4 0 4-0 2 )
山东黄金集团公司资助
