Isotopic and geochemical evidence for the origin of Plio-Pleistocene volcanic rocks near the Indo-Eurasian collisional margin at Tengchong, China

Details Isotopic and geochemical evidence for the origin of Plio-Pleistocene volcanic rocks near the Indo-Eurasian collisional margin at Tengchong, China Isotopic and geochemical evidence for the origin of Plio-Pleistocene volcanic rocks near the Indo-Eurasian collisional margin at Tengchong, China

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..65..263z&link_type=abstract

Earth and Planetary Science Letters, Volume 65, Issue 2, p. 263-275.

Mathematics

Logic

8

Scientific paper

In Yunnan Province, China, regional extensional stresses associated with the collision between India and Asia have formed a series of downfaulted north-south-trending basins. Near Tengchong, in extreme Western Yunnan close to the Burma border, one of these basins is characterized by volcanism which began in the Pliocene (~ 7 m.y.) and has continued to historic times. The Tengchong volcanic suite ranges in composition from basalt to dacite, with most lavas being potassium rich. Five chemical groups can be recognized based on major element, trace element and isotopic compositions. These groups are broadly consistent with previous groupings made on the basis of geologic and age data. The chemical and isotopic data show that the main series (most voluminous) lavas were derived by partial melting of a metasomatized and heterogeneous mantle source, with crustal and possibly seawater components probably related to prior subduction beneath Asia. An andesite-dacite series with similarities to Tibetan calc-alkaline lavas shows clear indications of assimilated crust and crystal fractionation. There is no evidence in these rocks for the presence of a strongly depleted subcontinental mantle such as has been recognized elsewhere [5,21].

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