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Abstract

Chu Lai body granitoid typically had the gneiss structure. Petrography inclueded biotite and two-mica granitogneiss. The rock consisted of quartz (25 – 30%), plagioclase (28 – 30%), akaline feldspar (30 – 32%), biotite (7 – 8%) and musscovite (3 – 5%). Accessory minerals were zircone, apatite, garnet, etc. Geochemical characteristics were typically high SiO2 (73.89 – 74.38 wt%); high total amount of alkali (Na2O + K2O ̴ 8.28 – 8.89%). Aluminous saturation indexs - ASI (Al2O3/CaO + Na2O + K2O) are more than 1. They have enrichment of the lipthophile elements with high Cs, Rb and Pb indexs; negative anomalies were Nb, Ta and strong Eu, specially. Eu/Eu* values were very low (0.041 – 0.056). The petrographic and geochemical charecteristics showed that Chu Lai rocks were S-granite, formed during the collision tectonic between Indochina and South China block in the early Paleozoic.



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Issue: Vol 2 No 4 (2018)
Page No.: 191-201
Published: Aug 14, 2019
Section: Original Research
DOI: https://doi.org/10.32508/stdjns.v2i4.828

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Copyright: The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 How to Cite
Vu, H., & Pham, H. (2019). Geochemical characteristics of Chu Lai body granitoids in Nui Thanh, Quang Nam. Science and Technology Development Journal - Natural Sciences, 2(4), 191-201. https://doi.org/https://doi.org/10.32508/stdjns.v2i4.828

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