本文選題：陶灣巖塊　切入點：碳酸質(zhì)糜棱巖　出處：《合肥工業(yè)大學(xué)》2015年碩士論文

【摘要】：東秦嶺造山帶北緣的陶灣巖塊中分布著一套碳酸質(zhì)糜棱巖,具明顯的塑性變形,其展布和變質(zhì)變形特征嚴格受洛南—欒川斷裂帶的控制和影響。根據(jù)洛欒—欒川斷裂帶晚加里東-早海西期強烈活動的特點,認為是陶灣巖塊碳酸鹽巖在洛南—欒川斷裂帶晚加里東—早海西期構(gòu)造活動過程中形成的。因此,對這套碳酸質(zhì)糜棱巖的變質(zhì)變形特征及形成環(huán)境分析,可揭示洛南—欒川斷裂帶在這一時期構(gòu)造活動的運動學(xué)、動力學(xué)及流變學(xué)特征。本文通過野外詳細的觀察和測量,結(jié)合室內(nèi)顯微構(gòu)造分析和溫壓條件的計算,確定陶灣巖塊碳酸質(zhì)糜棱巖面理產(chǎn)狀基本傾向NNE,線理發(fā)育,表現(xiàn)為由N向S逆沖兼有左旋剪切的運動學(xué)特征；其變質(zhì)相屬低綠片巖相,變形機制是以方解石動態(tài)重結(jié)晶和細�；饔脼橹鞯乃苄宰冃�；變形溫度為350℃-470℃,差異應(yīng)力為10-40MPa；石英應(yīng)變橢球體形態(tài)為壓扁型橢球體,顯示陶灣巖群遭受了強烈擠壓變形。所以,陶灣巖群碳酸質(zhì)糜棱巖是在強烈的斜向擠壓碰撞環(huán)境下形成的,是秦嶺微陸塊向華北板塊下斜向俯沖碰撞的結(jié)果。
[Abstract]:In the northern margin of the East Qinling orogenic belt, there is a set of carbonate mylonites in the Taowan block, with obvious plastic deformation. The distribution and metamorphic deformation characteristics are strictly controlled and influenced by the Luonan-Luanchuan fault zone. According to the strong activity in the late Caledonian and early Hercynian period in the Luoluan-Luanchuan fault zone, It is considered that carbonate rocks in the Taowan block were formed during the late Caledonian to early Hercynian tectonic activity in the Luonan-Luanchuan fault zone. Therefore, the metamorphic deformation characteristics and forming environment of the carbonate mylonite are analyzed. The characteristics of kinematics, dynamics and rheology of tectonic activity in Luonan-Luanchuan fault zone during this period can be revealed. Through detailed observation and measurement in the field, combined with indoor microstructural analysis and calculation of temperature and pressure conditions, It is determined that the metamorphic facies of the carbonate mylonites in the Taowan block are characterized by low greenschist facies, with the basic tendency of NNEs and the linear development, which is characterized by the kinematic characteristics of left-lateral shear from N to S thrusts, and the metamorphic facies is a low-greenschist facies. The deformation mechanism is plastic deformation with calcite dynamic recrystallization and fine granulation, the deformation temperature is 350 鈩，

本文編號：1666398