原文服务方: 地球化学学报(英文)       
摘要:
A large number of Eocene–Oligocene alkaline/alkali-rich igneous rocks were developed in the Tuotuohe region of the Qinghai-Tibetan Plateau. In this study, we present zircon U–Pb ages, Hf isotope data, and major and trace element compositions of the Cenozoic alkaline rocks from the Tuotuohe region in order to constraint the petrogenesis and tectonic evolution history of Qiangtang Block. Zircon U–Pb ages were measured via LA–ICP–MS to be 39.6, 37.6 and 32.0 Ma. The 39.6 Ma trachyte was characterized by low SiO2 and high K2O and MgO contents. The 37.6 and 32.0 Ma orthophyres show enrichment in SiO2 and K2O, but deficient in MgO. All of the samples belong to the alkaline rocks. These rocks display enrichment in REE, LREE, and LILE, depletion in HFSE, and no obvious Eu anomalies. Geological and geochemical features suggest that there were two possible mechanisms for the origin of the alkaline rocks in the Tuotuohe region: (1) the removed mafic lower crust dropped into the asthenosphere, forming the mix magma (Nariniya trachyte); (2) the upwelling asthenosphere triggered the crustal melting (Nariniya and Zamaqu orthophyre). The Eocene–Oligocene alkaline rocks in the study and adjacent areas are likely to be the result of the same tectonic–magmatic event of deep lithospheric evolution that is the crustal material melting triggered by lithospheric delamination. This conclusion extends the influence scope of lithospheric delamination eastward to the Tuotuohe region (~92° E) from Banda Co (~ 82° E).
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篇名 Zircon U–Pb age and geochemical constraints on the origin and tectonic implication of the Tuotuohe C
来源期刊 学科 地球科学
关键词 Zircon U–Pb chronology Zircon Hf isotopic Delamination Tuotuohe region Qinghai–Tibetan Plateau
年,卷(期) 2022,(1) 所属期刊栏目
研究方向 页码范围 67-84
页数 17页 分类号
字数 语种 英文
DOI 10.1007/s11631-019-00354-w
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Zircon U–Pb chronology
Zircon Hf isotopic
Delamination
Tuotuohe region
Qinghai–Tibetan Plateau
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地球化学学报(英文)
双月刊
2096-0956
52-1161/p
16开
贵阳市林城西路99号
1982-01-01
英语
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230
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