Protracted and Progressive Crustal Melting during Continental Collision in the Pamir and Plateau Growth
文献类型：期刊论文
| 作者 | Tang, Gong-Jian4,5; Wyman, Derek A.1; Dan, Wei4,5 ; Wang, Qiang4,5; Liu, Xi-Jun3; Yang, Ya-Nan4,5; Gadoev, Mustafo2; Oimahmadov, Ilhomjon2
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| 刊名 | JOURNAL OF PETROLOGY
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| 出版日期 | 2024-04-01 |
| 卷号 | 65期号:4页码:28 |
| 关键词 | Leucogranite Hf-O isotopes crustal melting plateau growth Pamir-Tibet |
| ISSN号 | 0022-3530 |
| DOI | 10.1093/petrology/egae024 |
| 英文摘要 | Determining crustal melting in parallel with geodynamic evolution provides critical information on plateau crustal thickening and uplift. Here we investigate the timing and duration of crustal melting through in situ analysis of zircon U-Pb ages, trace elements and Hf-O isotopes, and whole-rock elements and Sr-Nd-Hf isotopes for the granites and high-grade metamorphic rocks from the Pamir Plateau. Zircon dates record protracted crustal melting for both Central Pamir (43-33 and 22-12 Ma) and South Pamir (28-10 Ma). The Pamir Cenozoic granites are characterized by significant elemental and isotopic heterogeneity. The elemental variability within the Pamir Cenozoic granites is dominantly attributed to fractional crystallization of K-feldspar and plagioclase with subordinate biotite from a variably fractionated melt, and the accumulation of early crystallized feldspar during magma ascent. Peritectic mineral entrainment and accessory mineral crystallization had some influence on the geochemical characteristics of the garnet-bearing leucogranite dikes. Zircon Hf isotopes and whole-rock Sr-Nd-Hf isotopes show secular variations for both Central and South Pamir granites. The Central Pamir granites show a mild decrease in whole-rock sigma Nd(t) values from Eocene (-4.3 to -4.9) to Miocene (-6.2 to -7.7), and the zircon sigma Hf(t) values decrease from c. 40 Ma (+2 to -5) to c. 10 Ma (-4 to -8). In contrast, the South Pamir granites have highly variable whole-rock Sr-Nd-Hf (87Sr/86Sr(i) = 0.7053 to 0.7830; sigma Nd(t) = -31.5 to +0.2; sigma Hf(t) = -40.0 to +8.2) and zircon Hf isotopes (sigma Hf(t) = -31.7 to +7.5) and display a strong decrease in sigma Nd(t) and sigma Hf(t) values from c. 25 Ma to c. 13 Ma. Geochemical and isotopic data indicate that both the Central and South Pamir experienced crustal melting from juvenile lower crust to ancient lower-middle crustal materials, and Indian crustal materials were incorporated into the melt region of the South Pamir leucogranites from c. 20 Ma. Our study highlights a causal link between a chain of events that includes magma underplating induced by lithosphere thinning and slab breakoff, lithosphere delamination and underthrusting of Indian lithosphere, and formation of the Cenozoic granites in Pamir. This series of processes are incorporated here into a comprehensive model for the geodynamic evolution of the Pamir during the India-Asia collision. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001195928900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77178]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Tang, Gong-Jian |
| 作者单位 | 1.Univ Sydney, Sch Geosci, Madsen Bldg F09, Sydney, NSW 2006, Australia 2.Tajik Acad Sci, Inst Geol Earthquake Engn & Seismol, Ayni St 267, Dushanbe 734063, Tajikistan 3.Guilin Univ Technol, Coll Earth Sci, Guangxi Key Lab Explorat Hidden Met Ore Deposits, Yanshan St 319, Guilin 541006, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Kehua St 511, Guangzhou 510640, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Kehua St 511, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Gong-Jian,Wyman, Derek A.,Dan, Wei,et al. Protracted and Progressive Crustal Melting during Continental Collision in the Pamir and Plateau Growth[J]. JOURNAL OF PETROLOGY,2024,65(4):28. |
| APA | Tang, Gong-Jian.,Wyman, Derek A..,Dan, Wei.,Wang, Qiang.,Liu, Xi-Jun.,...&Oimahmadov, Ilhomjon.(2024).Protracted and Progressive Crustal Melting during Continental Collision in the Pamir and Plateau Growth.JOURNAL OF PETROLOGY,65(4),28. |
| MLA | Tang, Gong-Jian,et al."Protracted and Progressive Crustal Melting during Continental Collision in the Pamir and Plateau Growth".JOURNAL OF PETROLOGY 65.4(2024):28. |
入库方式： OAI收割
来源：广州地球化学研究所
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