| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
SUN Zaibo, HU Shaobin, LI Jing, DUAN Xiangdong, LIU Fulai, ZHOU Kun, ZHAO Jiangtai, LI Xiaojun, BAO Jiafeng, WANG Yunxiao. 2023. Blueschists in Damenglong, Jinghong City, southwestern Yunnan, China: Petrology and metamorphism and their implications for the Paleo-Tethys[J]. Geology in China, 50(4): 1233-1249. doi: 10.12029/gc20200213002
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Blueschists in Damenglong, Jinghong City, southwestern Yunnan, China: Petrology and metamorphism and their implications for the Paleo-Tethys
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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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References
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SUN Zaibo, HU Shaobin, LI Jing, DUAN Xiangdong, LIU Fulai, ZHOU Kun, ZHAO Jiangtai, LI Xiaojun, BAO Jiafeng, WANG Yunxiao. 2023. Blueschists in Damenglong, Jinghong City, southwestern Yunnan, China: Petrology and metamorphism and their implications for the Paleo-Tethys[J]. Geology in China, 50(4): 1233-1249. doi: 10.12029/gc20200213002
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Figure 1.
(a) Tectonic framework of Southeast Asia (modified from Sone and Metcalfe, 2008); (b) Geological sketch of the Changning-Menglian suture belt (modified from Burchfiel and Chen, 2013; Li et al., 2015)
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Figure 2.
Geological sketch of the Damenglong area in Jinghong City
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Figure 3.
Outcrops and photomicrographs of blueschists in the Damenglong area, Jinghong City
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Figure 4.
Mineral component diagrams of amphiboles in the muscovite-garnet-glaucophane-quartz schists and chlorite-epidote-actinolite-glaucophane schists from the Damenglong-Mengsongba area, Jinghong City (after Leake et al., 1997)
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Figure 5.
Compositional zoning diagram of garnet porphyroblasts in the muscovite-garnet-glaucophane-quartz schists from the Damenglong area, Jinghong City
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Figure 6.
Si vs. Al diagram (a; after Wei Chunjing and Zhu Wenping, 2007) and Al2O3 vs. FeO diagram (b; after Miyashiro, 1979) of muscovite in the muscovite-garnet-glaucophane-quartz schist and garnet-bearing chloritoid-muscovite schist from the Damenglong-Mengsongba area, Jinghong City
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Figure 7.
P-T estimation for the muscovite-garnet-glaucophane-quartz schist from the Damenglong area, Jinghong City (after Masone and Szpurka, 1997)
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Figure 8.
AlⅣ- NaM4 diagram of amphibole(Brown, 1977)(a) and metamorphic P-T diagram of glaucophan(据Moody et al., 1983)(b) in the chlorite-epidote-actinolite-glaucophane schist from the Damenglong area, Jinghong City
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Figure 9.
Metamorphic P-T estimations for blueschists from the Damenglong area, Jinghong area. The major metamorphic facies is after Evans(1990), Liou and Zhang (2003); Diagnostic reaction Core= Qz is after Oh and Liou(1998)