کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4713941 1638410 2011 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Origin of Late Permian Emeishan basaltic rocks from the Panxi region (SW China): Implications for the Ti-classification and spatial–compositional distribution of the Emeishan flood basalts
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Origin of Late Permian Emeishan basaltic rocks from the Panxi region (SW China): Implications for the Ti-classification and spatial–compositional distribution of the Emeishan flood basalts
چکیده انگلیسی

Basalts and a mafic dyke collected from the city of Panzhihua show characteristics of high-Ti and low-Ti Emeishan basalts respectively. The dyke yielded a SHRIMP zircon U–Pb mean age of 261 ± 5 Ma making it contemporaneous with the eruption of Emeishan basalts. The basalts have ISr ranging from 0.7059 to 0.7062 with εNd(T) ranging from −1.1 to + 0.7 whereas the dyke has ISr ranging from 0.7056 to 0.7064 with εNd(T) ranging from + 0.3 to + 0.5. Trace element modeling shows that the two rock types can be generated by different degrees of partial melting from the same garnet-bearing source. Assimilation of crustal material is required in order to produce the depletion of some trace elements (e.g. Nb and Ta) of the dyke however crustal assimilation is not required to produce the basalts. Trace element modeling and isotopic data of the Emeishan basalts suggest that, in general, the high- and low-Ti basaltic rocks are likely derived from the same source and represent different degrees of partial melting with or without crustal assimilation. The location and geological relationships of the ‘high-Ti’ basalts indicate they erupted relatively early and within the central part of the ELIP, casting doubt on the previous spatial–compositional distribution of the Emeishan basalts.

Research highlights
► Emeishan basaltic rocks can be produced by one source.
► Crustal assimilation is important for some basaltic rocks.
► The current classification scheme is of little use.
► There is no spatial–compositional distribution of ELIP basaltic rocks.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 199, Issues 1–2, 1 January 2011, Pages 85–95
نویسندگان
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