本文關鍵詞： 桐柏雜巖北界剪切帶 位移量 分維度 差異應力 應變速率　出處：《地質論評》2017年03期 　論文類型：期刊論文

【摘要】：桐柏雜巖北界剪切帶是桐柏—大別造山帶發(fā)育的一條大型的左行走滑韌性剪切帶,發(fā)育糜棱巖、超糜棱巖以及強直片麻巖等強變形巖石。通過對剪切帶內巖石的礦物共生組合、剪切帶的位移量計算、石英的分維數計算、石英顆粒的差異應力以及應變速率的估算等多種方法分析結果顯示:桐柏雜巖北界剪切帶的位移量為38.3~41.1km;動態(tài)重結晶石英顆粒邊界統(tǒng)計數據的相關系數R均大于0.96,動態(tài)重結晶顆粒邊界具有統(tǒng)計意義上的自相似性;分維數為1.207~1.302之間,從剪切帶的核部向邊部,顆粒粒徑和分維值的變化是逐漸變大的。石英的分維值反映出石英的動態(tài)重結晶與剪切帶密切相關,變質變形由剪切帶核部向邊部逐漸減弱。桐柏雜巖北界剪切帶的差異應力值為23.583~46.983 MPa之間,應變速率為1.70×10~(-11)~9.74×10~(-11)s~(-1)。通過對比剪切帶內動態(tài)重結晶石英顆粒的粒徑、差異應力和應變速率可以發(fā)現,差異應力與應變速率表現出一定的正相關性,都隨著從剪切帶的核部到邊部慢慢變小;而石英的粒徑則與差異應力和應變速率表現出負相關性,從剪切帶核部到邊部,隨著石英粒徑的變大,差異應力和應變速率變小。差異應力越大,導致石英顆粒的受力強度越大,變形越強,表現出來的就是應變速率越強。從顯微構造變形角度來研究認識該剪切帶,對揭示桐柏—大別造山帶的構造演化以及構造模型的建立有著重要的構造意義。
[Abstract]:The north boundary shear zone of Tongbai complex is a large left strike-slip ductile shear zone developed in Tongbai-Dabie orogenic belt and developed mylonite. Ultramylonite and strong gneiss are strongly deformed rocks. Through the mineral symbiotic assemblage of rocks in the shear zone, the displacement of shear zone and the fractal dimension of quartz are calculated. The analysis results of different stress and strain rate of quartz grain show that the displacement of the shear zone in the north boundary of Tongbai complex is 38.3 km; The correlation coefficient R of the dynamic recrystallized quartz grain boundary statistical data is greater than 0.96, and the dynamic recrystallization grain boundary has statistical self-similarity. The fractal dimension is between 1.207 and 1.302, from the core to the edge of the shear band. The change of particle size and fractal dimension is gradually increasing. The fractal dimension of quartz reflects that the dynamic recrystallization of quartz is closely related to the shear zone. Metamorphic deformation gradually weakened from the core to the edge of the shear zone. The differential stress of the northern boundary shear zone of the Tongbai complex is between 23.583 and 46.983 MPa. The strain rate is 1.70 脳 10 ~ (10) ~ (-11) ~ 9.74 脳 10 ~ (10) ~ (-1) ~ (-1). The particle size of dynamic recrystallized quartz in the shear zone is compared. Differential stress and strain rate can be found that the differential stress and strain rate show a certain positive correlation with the shear band from the core to the edge gradually become smaller; The particle size of quartz is negatively correlated with the differential stress and strain rate. From the core to the edge of the shear band, the differential stress and strain rate become smaller with the increase of the quartz particle size. The greater the differential stress is, the greater the differential stress is. As a result, the greater the stress strength of quartz particles, the stronger the deformation, and the stronger the strain rate. The shear zone is studied and recognized from the angle of microstructure deformation. It is of great tectonic significance to reveal the tectonic evolution of Tongbai-Dabie orogenic belt and the establishment of tectonic model.
【作者單位】： 合肥工業(yè)大學資源與環(huán)境工程學院;青海省地質調查局;
【基金】：國家自然科學基金資助項目(編號:41272222;41502193)的成果~~
【分類號】：P542

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