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Potassic magma genesis and the Ailao Shan-Red River fault

文献类型：期刊论文

作者Flower, Martin F. J.1; Nguyen Hoang2; Lo, Chinh-hua3; Cung Thu'o'ng Chi2; Nguyen Quoc Cu'o'ng2; Liu, Fu-tian4; Deng, Jin-fu5; Mo, Xuan-xue5
刊名JOURNAL OF GEODYNAMICS
出版日期2013-09-01
卷号69页码:84-105
关键词Ailao Shan-red River Fault Escape Tectonics Ultrapotassic Magma Asthenospheric Corner Flow Lithosphere Delamination
ISSN号0264-3707
DOI10.1016/j.jog.2012.06.008
文献子类Article
英文摘要Two types of K-rich magma of Eocene to Early Oligocene (ca. 40-30) and Plio-Pleistocene (ca. 5-0.1 Ma) age were emplaced prior to and following left-lateral slip on the Ailao Shan-Red River (ASRR) fault, a regional shear zone extending between southwest China and the Tonkin Gulf (South China Sea) that accommodated 'escape' of the Indochina block. The first type is exposed in the Dali-Lijiang and adjacent regions of western Yunnan and Sichuan and comprises ultramafic potassic to ultrapotassic 'absarokites' and their shoshonite, banakite, and SiO2-rich derivatives which were emplaced immediately prior to activation of the ASRR fault. They are characterized by high Mg.-nos, and low contents of fusible oxides (FeO*, CaO, Al2O3), for equivalent MgO content, and pronounced primitive mantle-normalized high-field strength element (HFSE) depletions. In contrast, 'post-escape' K-rich magmas were erupted in the Puer, Maguan-Pingbian regions of south and southeast Yunnan. Apart from their relative enrichments in potassium they show typical HFSE-rich intra-plate compositional affinity. Geological and geomorphic evidence, and thermochronologic age dating of metamorphisc events, suggest that left-lateral shearing occurred between ca. 30 and 17 Ma; thereby accommodating the southeastward 'escape' of Indochina and (possibly) two episodes of spreading in the South China Sea. The southwestern part of Dali-Lijiang magmatic products was detached and offset by ca. 600 km and are now located in Phan Xi Pang in northern Viet Nam. The same is true for the Permo-Triassic Emeishan flood basalts, whose western exposures were likewise displaced by the same amount and are now represented by the Song Da complex, also in northern Viet Nam. Here, we report geochemical, isotopic, and Ar-40/Ar-39 age data for samples from both the 'pre-escape' Dali-Lijiang magmas and the 'post-escape' K-rich Puer, Maguan-Pingbian basalts and basanites, with a view to comparing and contrasting their interpolated source compositions, estimated conditions of upper mantle melt segregation and, by inference, their mantle dynamic and contamination histories insofar as these were conditioned by the India-Asia collision. Our interpretations yielded two complementary conclusions. The first contends that the pre-escape magmas result from adiabatic melting of crust-contaminated asthenosphere comprising a 'melange' of continental lithospheric mantle (CLM) (hydrated by sab-derived hysdrous fluids released at 0.2-0.5 GPa) and lower crust, delaminated from the overriding plate during mantle wedge corner flow and further enriched by metasomatic melts of subducted continental crust. We postulate that incipient H2O-saturated melting of the 'melange' occurs at depths of between ca. 100 and 200 km after being 'dragged' down by relict oceanic slab fragments, in response to the dehydration of supra-subduction amphibole- and phlogopite. The ensuing viscosity 'crisis' and buoyancy relative to ambient 'fertile' convecting mantle of such asthenospheric 'pockets', and the collision-related change from lithospheric compression to extension, almost certainly predisposes such a refractory yet crust-contaminated 'pockets' to rapid adiabatic melting.
WOS关键词TIBETAN PLATEAU IMPLICATIONS ; HIGH-MAGNESIAN ANDESITES ; SETOUCHI VOLCANIC BELT ; INDO-ASIAN COLLISION ; LOWER-CRUSTAL FLOW ; LEFT-LATERAL SHEAR ; SOUTH CHINA BASIN ; ANALYSIS HP-DTA ; ULTRAPOTASSIC ROCKS ; WESTERN YUNNAN
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000324356300007
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构NAFOSTED (Viet Nam)(105-05-40-09 ; NAFOSTED (Viet Nam)(105-05-40-09 ; NSF (USA)(EAR 0429092 ; NSF (USA)(EAR 0429092 ; UNESCO-IUGS ; UNESCO-IUGS ; NSF (China) ; NSF (China) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 105-03-05-09) ; 105-03-05-09) ; EAR-9120296) ; EAR-9120296) ; NAFOSTED (Viet Nam)(105-05-40-09 ; NAFOSTED (Viet Nam)(105-05-40-09 ; NSF (USA)(EAR 0429092 ; NSF (USA)(EAR 0429092 ; UNESCO-IUGS ; UNESCO-IUGS ; NSF (China) ; NSF (China) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 105-03-05-09) ; 105-03-05-09) ; EAR-9120296) ; EAR-9120296) ; NAFOSTED (Viet Nam)(105-05-40-09 ; NAFOSTED (Viet Nam)(105-05-40-09 ; NSF (USA)(EAR 0429092 ; NSF (USA)(EAR 0429092 ; UNESCO-IUGS ; UNESCO-IUGS ; NSF (China) ; NSF (China) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 105-03-05-09) ; 105-03-05-09) ; EAR-9120296) ; EAR-9120296) ; NAFOSTED (Viet Nam)(105-05-40-09 ; NAFOSTED (Viet Nam)(105-05-40-09 ; NSF (USA)(EAR 0429092 ; NSF (USA)(EAR 0429092 ; UNESCO-IUGS ; UNESCO-IUGS ; NSF (China) ; NSF (China) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 105-03-05-09) ; 105-03-05-09) ; EAR-9120296) ; EAR-9120296)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86334]  
专题中国科学院地质与地球物理研究所
通讯作者Flower, Martin F. J.
作者单位1.Univ Illinois, Dept Earth & Environm Sci, Chicago, IL 60607 USA
2.Vietnam Acad Sci & Technol, Inst Geol Sci, Hanoi, Vietnam
3.Natl Taiwan Univ, Dept Geol, Taipei 106, Taiwan
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China
5.China Univ Geosci, State Key Lab Earth Sci, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Flower, Martin F. J.,Nguyen Hoang,Lo, Chinh-hua,et al. Potassic magma genesis and the Ailao Shan-Red River fault[J]. JOURNAL OF GEODYNAMICS,2013,69:84-105.
APA Flower, Martin F. J..,Nguyen Hoang.,Lo, Chinh-hua.,Cung Thu'o'ng Chi.,Nguyen Quoc Cu'o'ng.,...&Mo, Xuan-xue.(2013).Potassic magma genesis and the Ailao Shan-Red River fault.JOURNAL OF GEODYNAMICS,69,84-105.
MLA Flower, Martin F. J.,et al."Potassic magma genesis and the Ailao Shan-Red River fault".JOURNAL OF GEODYNAMICS 69(2013):84-105.

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