Blueschists in Damenglong, Jinghong City, southwestern Yunnan, China: Petrology and metamorphism and their implications for the Paleo-Tethys
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摘要:
研究目的 蓝片岩为古洋壳的俯冲及洋-陆和陆-陆碰撞拼贴的产物，对深入探索洋壳或陆壳俯冲变质过程以及造山带的形成演化具有十分重要的意义。本文选择以滇西景洪大勐龙地区新发现的蓝片岩为研究对象，探讨其对昌宁—孟连古特提斯洋俯冲-造山背景的制约。
研究方法 通过岩相学与矿物化学分析，根据矿物组合的不同，识别出研究区内两种不同类型的蓝片岩，初步建立变质演化P-T轨迹，并结合区域地质资料分析蓝片岩的成因机制与就位的动力学背景，约束昌宁—孟连古特提斯洋俯冲-造山演化。
研究结果 获得白云母石榴蓝闪石英片岩峰期变质温压条件为T=450~490℃，P=0.90~1.45 GPa，绿泥绿帘阳起蓝闪片岩具有较低的峰期变质温压条件为T=430~470℃，P=0.69~0.73 GPa，并初步建立了两种不同类型蓝片岩变质演化P-T轨迹。
结论 两类峰期变质条件的差异可能为俯冲隧道中不同俯冲深度的蓝片岩，这一研究成果为进一步探索昌宁—孟连古特提斯洋的俯冲消减-闭合的构造演化过程提供重要依据。
Abstract:This paper is the result of geological survey engineering.
Objective Bluesschist is the product of subduction of ancient oceanic crust and collage of ocean-continental and land-continental collisions. It is of great significance to further explore the subduction metamorphism of oceanic crust or continental crust and the formation and evolution of orogenic belts. In this paper, the newly discovered bluesschist in Damenglong area, Jinghong, western Yunnan, is selected as the research object, and its restriction on the Changning-Menglian Paleo-Tethys Ocean subduction-orogenic setting is discussed.
Methods Through petrography and mineral chemistry analysis, two different types of bluesschist in the study area are identified according to different mineral combinations, and the P-T trajectory of metamorphic evolution is initially established. Combined with regional geological data, the genetic mechanism and dynamic background of bluesschist are analyzed to constrain the evolution of Changning-Menglian Paleo-Tethys Ocean subduction and orogeny.
Results The results show that the peak metamorphic temperature and pressure conditions of muscovite-garnet-glaucophane-quartz schists are T =450-490℃, P=0.90-1.45 GPa, and chlorite-epidote-actinolite-glaucophane schist with the low peak metamorphic temperature and pressure conditions are T = 430-470℃, P = 0.69-0.73 GPa. The P-T tracks of metamorphic evolution of two different types of bluesschist are preliminarily established.
Conclusions The metamorphic differences of the two types of blueschists occur might because the metamorphic rocks subducted to different depths were uplifted to the surface via subduction tunnels through the exhumation mechanism. The results of this study will provide an important basis for further exploring the subduction and closure of the Paleo-Tethys Ocean in the Changning-Menglian suture zone.
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图 1 东南亚主要板块构造带分布图(a，据Sone and Metcalfe, 2008)和三江南段昌宁—孟连结合带地质简图(b，据Burchfiel and Chen, 2013; Li et al., 2015修改)
Figure 1.
图 4 景洪大勐龙勐宋坝地区白云石榴蓝闪石英片岩和绿泥绿帘阳起蓝闪片岩中闪石族矿物成分图解(根据Leak et al., 1997)
Figure 4.
图 6 景洪大勐龙勐宋坝地区白云石榴蓝闪石英片岩和含石榴硬绿泥石白云母片岩中白云母Al-Si图解(a, 魏春景和朱文萍，2007)和Al2O3-FeO图解(b, Miyashiro, 1979)
Figure 6.
图 7 景洪大勐龙地区白云石榴蓝闪石英片岩的P-T条件估算(据Masone and Szpurka, 1997)
Figure 7.
图 8 景洪大勐龙地区绿泥绿帘阳起蓝闪片岩角闪石NaM4-AlⅣ相图(a，底图据Brown, 1977)蓝闪石变质作用的P-T图解(b，底图据Moody et al., 1983)
Figure 8.
图 9 景洪大勐龙地区蓝闪片岩变质P-T条件估算变质相系参考Evans(1990)和Liou and Zhang (2003)；变质反应Coe=Qz参考Oh and Liou(1998)
Figure 9.
表 1 白云石榴蓝闪石英片岩及围岩(石榴硬绿泥白云片岩)的主要矿物成分数据(%)
Table 1. Representative mineral components of the muscovite-garnet-glaucophane-quartz schists and their surrounding rocks (garnet-chloritoid-muscovite schist) (%)
下载: 导出CSV
表 2 绿泥绿帘阳起蓝闪片岩主要矿物成分数据(%)
Table 2. Representative mineral components of chlorite-epidote-actinolite-glaucophane schists (%)
下载: 导出CSV
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