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Abstract <p>The Kong Chro granitoid exhibits a uniform body and is distributed in the southeastern part of the Kontum massif, belonging to the Indochina block. The lithological composition includes granite, biotite hornblende granite, and granodiorite, which are characterized by a pinkish-gray color and fine to coarse grains. The major minerals comprise plagioclase (30–35%), K-feldspar (30–35%), quartz (20–30%), biotite (&lt;10%), and hornblende (&lt;5%), while accessory minerals include zircon, apatite, ore minerals, and sphene. The Kong Chro granitoid has high SiO<sub>2</sub> (69.65–73.70 wt %), and medium Al<sub>2</sub>O<sub>3</sub> (13.45–14.00 wt %) with an aluminum saturation index (A/CNK) range of 0.92–1.03. It is high CaO (0.71–2.05 wt %), high Fe<sub>2</sub><InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11471_2025_5131_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{O}}_{3}^{{\text{t}}}\)</EquationSource> <!--EarthSci2560770Pham-m1--> </InlineEquation> (1.78–3.24 wt %), low MnO (0.02–0.09 wt %), generally high MgO (0.13–0.57 wt %), high TiO<sub>2</sub> (0.12–0.32&#xa0;wt %), and low P<sub>2</sub>O<sub>5</sub> (0.02–0.10 wt %). Trace elements display obvious negative anomalies for Ba, Nb, P, and Ti, as well as obvious positive anomalies for Th, K, Pb, and Y. The notable negative anomalies of Ba, P, and Ti are attributed to the fractional crystallization of plagioclase, apatite, ilmenite, and titanomagnetite, while the positive anomaly of K is linked to the fractional crystallization of K-feldspar. U−Pb zircon isotopic analysis using the LA-ICP-MS method yields an average <sup>206</sup>Pb/<sup>238</sup>U age of 236.5 Ma, corresponding to the late Triassic period. The formation process of the Kong Chro granitoid may be related to the collisional events between the Indochina and South China blocks during the Permian-Triassic period.</p>

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Geochemistry and Petrogenesis of Kong Chro Granitoid, Kontum Massif, Central Vietnam

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Pham Minh,
  • Truong Chi Cuong,
  • Doan Dinh Hung,
  • Pham Trung Hieu,
  • Pham Hong Phong,
  • Nguyen Thi Truong Giang

摘要

Abstract

The Kong Chro granitoid exhibits a uniform body and is distributed in the southeastern part of the Kontum massif, belonging to the Indochina block. The lithological composition includes granite, biotite hornblende granite, and granodiorite, which are characterized by a pinkish-gray color and fine to coarse grains. The major minerals comprise plagioclase (30–35%), K-feldspar (30–35%), quartz (20–30%), biotite (<10%), and hornblende (<5%), while accessory minerals include zircon, apatite, ore minerals, and sphene. The Kong Chro granitoid has high SiO2 (69.65–73.70 wt %), and medium Al2O3 (13.45–14.00 wt %) with an aluminum saturation index (A/CNK) range of 0.92–1.03. It is high CaO (0.71–2.05 wt %), high Fe2 \({\text{O}}_{3}^{{\text{t}}}\) (1.78–3.24 wt %), low MnO (0.02–0.09 wt %), generally high MgO (0.13–0.57 wt %), high TiO2 (0.12–0.32 wt %), and low P2O5 (0.02–0.10 wt %). Trace elements display obvious negative anomalies for Ba, Nb, P, and Ti, as well as obvious positive anomalies for Th, K, Pb, and Y. The notable negative anomalies of Ba, P, and Ti are attributed to the fractional crystallization of plagioclase, apatite, ilmenite, and titanomagnetite, while the positive anomaly of K is linked to the fractional crystallization of K-feldspar. U−Pb zircon isotopic analysis using the LA-ICP-MS method yields an average 206Pb/238U age of 236.5 Ma, corresponding to the late Triassic period. The formation process of the Kong Chro granitoid may be related to the collisional events between the Indochina and South China blocks during the Permian-Triassic period.