Petrogenesis and tectonic environment of the Middle Permian Luerma igneous complex in the southern Lhasa subterrane, Tibet: Evidence from geochemistry; Rb-Sr, Sm-Nd, and Lu-Hf isotopes; and zircon U-Pb geochronology

被引:1
作者
Liu, Hong [1 ,2 ]
Li, Guangming [1 ]
Li, Wenchang [1 ,3 ,6 ]
Ma, Dongfang [1 ,6 ]
Huang, Hanxiao [2 ]
Cao, Huawen [1 ]
Li, Youguo [2 ]
Huang, Yong [4 ]
Nie, Fei [1 ]
Song, Wenjie [5 ]
机构
[1] China Geol Survey, Geosci Innovat Ctr Southwest China, Chengdu Ctr, Chengdu, Peoples R China
[2] Chengdu Univ Technol, Coll Earth Sci, Chengdu, Peoples R China
[3] Kunming Univ Sci & Technol, Coll Land & Resources Engn, Kunming, Peoples R China
[4] China Geol Survey, Res Ctr Appl Geol, Chengdu, Peoples R China
[5] Sch Geol Engn, Inst Disaster Prevent, Langfang, Peoples R China
[6] China Geol Survey, Chengdu Ctr, Geosci Innovat Ctr Southwest China, 2211 Sci City East Rd, Tianfu New Area, Chengdu 610218, Peoples R China
基金
中国国家自然科学基金;
关键词
Daggyai Co; Middle Permian; opening of the Neo-Tethyan Ocean; within-plate basalt; Yawa; WHOLE-ROCK GEOCHEMISTRY; PORPHYRY COPPER BELT; VOLCANIC-ROCKS; CU-MO; CHINA CONSTRAINTS; TETHYAN HIMALAYA; OROGENIC BELT; AU DEPOSIT; GANGDESE; ORIGIN;
D O I
10.1002/gj.4807
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Due to the lack of corresponding magmatic records, the timing of the opening of the Yarlung-Tsangpo Neo-Tethyan Ocean remains controversial. The Middle Permian Luerma igneous complex, which is situated in the western Gangdese magmatic belt of the southern Lhasa subterrane, western Tibet, can be divided into four or more rock types, including foid gabbro, amphibole gabbro, monzogabbro, and pyroxene-bearing monzodiorite. Through zircon U-Pb dating using laser ablation-inductively coupled plasma-mass spectrometry, the age of the Luerma igneous complex is determined to be similar to 261 Ma. The complex is rich in titanium, iron, magnesium, and total alkalis, with medium to high levels of calcium, potassium and aluminium, as well as low levels of silicon. Therefore, it is classified as a shoshonite-latite rock series. The complex is relatively enriched in light rare earth elements and high-field-strength elements, without obvious Eu and Ce anomalies. These rocks exhibit relatively low (Sr-87/Sr-86)(i) values, high epsilon(Nd)(t) values, and high epsilon(Hf)(t) values. The geochemical and isotopic characteristics indicate that the magmas are derived from partial melting of the upper mantle in an intraplate tectonic environment. The new data presented here provide supplementary evidence for the initial rifting of the Lhasa terrane from the northern margin of Gondwana during the Middle Permian. These data also confirm that the opening of the Yarlung-Tsangpo Neo-Tethyan Ocean occurred in the Middle Permian.
引用
收藏
页码:3026 / 3042
页数:17
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