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This paper presents a systematic study of late Cretaceous to early Tertiary magmatism in the eastern Gangdese batholith (Lhasa–Nyingchi segment), the southern Lhasa terrane, southern Tibet. Based on zircon U–Pb age, rock association and geochemistry, the magmatism can be divided into three stages: 95–86Ma (stage-1), 85–73Ma (stage-2) and 68–60Ma (stage-3), with a short magmatic quiescence or gap of...
The Himalayan leucogranites are critical for understanding the geodynamic process of Himalayan orogenesis. In this article, we present petrological, geochronological and geochemical results of the Ramba leucogranites that crop out in the center of the Ramba dome within the Tethyan Himalaya. U–(Th)–Pb dating of zircon, monazite and xenotime revealed three episodes of leucogranitic magmatism in the...
The Purang ophiolite tectonically was thrust over an Upper Cretaceous mélange south of the Yarlung-Zangbo Suture Zone (YZSZ) in SW Tibet. It comprises a large ultramafic massif of ~800km 2 , but plutonic and volcanic sections are notably absent. The Purang peridotite massif is dominated by harzburgites with minor clinopyroxene-poor lherzolites, which are occasionally intruded by gabbronoritic...
Petrology, geochemistry and ReOs isotopes of peridotite xenoliths from Maguan (Yunnan Province) are reported in this paper with the aims of constraining the age and evolution of the lithospheric mantle beneath the western margin of the Cathyasia block. The Maguan mantle xenoliths contain predominantly fertile lherzolites with whole-rock Al 2 O 3 contents of 2.42–4.99wt.%, and subordinate...
The Xinchang mantle xenoliths, including garnet lherzolites, spinel lherzolites and harzburgites, have been studied for the nature and age of the lithospheric mantle beneath southeastern (SE) China. The spinel harzburgites have refractory compositions, with 0.95–1.73wt.% Al 2 O 3 , 0.65–1.47wt.% CaO, 0.03–0.16wt.% TiO 2 and 2134–2422ppm Ni. The lherzolites (both spinel- and...
Potassic basaltic lavas erupted during the Cenzoic are widespread in Wudalianchi, Erkeshan and Keluo (WEK) areas, northeast China, and contain abundant mantle xenoliths. Mantle xenoliths in this study are selected from the Keluo potassic lavas, and mainly comprise spinel lherzolites and harzburgites with minor dunites and wehrlites. Modal metasomatism is evident in some Keluo xenoliths from the presence...
Plagioclase crystals with an anorthite content up to An 99 have been discovered in mantle peridotites from the Yungbwa ophiolite, which crops out along the Indus–Yarlung Zangbo Suture, southwestern Tibetan Plateau. Amphiboles of pargasitic composition also occur in these plagioclase peridotites. Microtextures support the view that both plagioclase and amphibole were formed metasomatically...
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