黑龙江省北二龙地区下石炭统科洛片麻岩岩石学特征及原岩恢复
Petrological Characteristics and Protolith Reconstruction of the Lower Carboniferous Kolo Gneiss in the North Erlong area of Heilongjiang Province
龙建1
作者信息
- 1. 江西省地质局第八地质大队,江西上饶 334000
- 折叠
摘要
北二龙公别拉河沿岸地区出露的下石炭统科洛片麻岩,普遍遭受了角闪岩相变质作用,塑性流变特征明显,流变褶皱、眼球状构造、拉伸线理发育,原岩特征基本改变.岩石类型有浅粒岩、黑云斜长变粒岩、黑云二长变粒岩、黑云斜长片麻岩、角闪斜长片麻岩、斜长角闪岩等.综合分析其岩石化学和岩石地球化学特征,该地区出露的下石炭统科洛片麻岩应为一套基性火山岩-中酸性火山碎屑岩,总体上具有岛弧火山岩和弧后盆地建造特征.
Abstract
The Lower Carboniferous Kolo gneiss exposed along the Gongbiela River in North Erlong has been subjected to amphibolite facies metamorphism.The plastic rheological characteristics are obvious,rheological fold,ocular structure and tensile lineation are developed,and the primary rock characteristics are basically changed.The rock types include leptite,biotite plagioclase granulite,biotite monzonite granulite,biotite plagioclase gneiss,hornblende plagioclase gneiss,and plagioclase amphibolite.Based on a comprehensive analysis of its petrochemical and petrogeochemical characteristics,it is considered that the Lower Carboniferous Colo gneiss in this area should be a set of basic volcanic-medium-acid pyroclastic rocks,which have the characteristics of island arc volcanic rocks and back-arc basin construction.
关键词
科洛片麻岩/岩石化学/岩石地球化学/原岩恢复Key words
Kolo gneiss/petrochemistry/petrogeochemistry/protolith reconstruction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据