Extraction of high-silica granites from an upper crustal magma reservoir: Insights from the Narusongduo magmatic system, Gangdese arc

Abstract

This is a preprint, the final version is subject to change, of the American Mineralogist (MSA) Cite as Authors (Year) Title. American Mineralogist, in press.

Thermal Pulse Induced by Emplacement of Ramba Leucogranites in Southern Tibet

“…The partitioning between zirconium and magma strongly depends on the changes of temperature. (Devoir et al, 2021;Zhou et al, 2020;Marxer and Ulmer, 2019;Borisov and Aranovich, 2019;Gervasoni et al, 2016). The calculated zirconium partition coefficients (Kd Zr Garnet-melt) from previous studies are between ~0.2±0.02 (Devoir et al, 2021), ~0.4±0.1 (Sisson and Bacon, 1992), ~0.36 (Jenner et al, 1993) and~0.3±0.02 (van Westrenen et al, 1999).…”

Microcontinent subduction and S-type volcanism prior to India–Asia collision

“…Data for the Xuru Tso granitoids and volcanic rocks are from Lee et al 9 , and Gao et al 10 . Other data for the Sinongduo granitoids and volcanic rocks are from Yang 11 , Zhou et al 12 , and Ding et al 21 . 3E,F) contents of 3.78-6.39% based on the CIPW calculation is even more enriched than the peraluminous felsic S-type series in the Lachlan fold belt and contrasts with the depleted I-type series 24 .…”

“…The same conclusion also can be reached from the radiogenic Pb isotopes (Supplementary Table S3). Two potential scenarios can be envisaged for formation of the Sinongduo S-type granitic rocks: (1) crustal anatexis 40,41 ; (2) extraction from shallow andesitic magma reservoir by fractional crystallization 12 . For the crustal anatexis hypothesis, a deep buried metasedimentary source is required for the generation of S-type magma 47 .…”

“…Data for the Xuru Tso granitoids and volcanic rocks are from Lee et al9 , and Gao et al10 . Other data for the Sinongduo granitoids and volcanic rocks are from Yang11 , Zhou et al12 , and Ding et al21 .…”