Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam
Permian Ben Giang-Que Son and Triassic Van Canh granitic rocks are widely distributed across the southern Kontum Massif, the basement of which consists mainly of metasedimentary rocks. The Ben Giang-Que Son granitic rocks are classified as I- to S-type and ilmenite-series granitic rocks, while the V...
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MDPI AG
2023-11-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/13/11/341 |
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| author | Etsuo Uchida Ko Yonezu Takumi Yokokura Nasuka Mori |
| author_facet | Etsuo Uchida Ko Yonezu Takumi Yokokura Nasuka Mori |
| author_sort | Etsuo Uchida |
| collection | DOAJ |
| description | Permian Ben Giang-Que Son and Triassic Van Canh granitic rocks are widely distributed across the southern Kontum Massif, the basement of which consists mainly of metasedimentary rocks. The Ben Giang-Que Son granitic rocks are classified as I- to S-type and ilmenite-series granitic rocks, while the Van Canh granitic rocks are classified as I-type and magnetite-series granitic rocks. Both granitic rock suites exhibit more or less adakitic properties, suggesting that the subduction of the high-temperature Song Ma Ocean crust, part of the Paleo-Tethys Ocean, beneath the Indochina Block produced adakitic magma. It is hypothesized that the differences between the two granitic rock suites were caused by differences in the quantities of incorporated continental crustal materials and carbon or graphite in clastic sedimentary rocks when their adakitic magma intruded into the continental crust. Based on their high initial Sr isotope ratios, the Ben Giang-Que Son granitic rocks evidently incorporated a higher quantity of continental crustal materials compared to the Van Canh granitic rocks, resulting in the former showing the signatures of ilmenite-series and I- to S-type granitic rocks. Consequently, the Ben Giang-Que Son granitic rocks have relatively high A/CNK ratios and high total Al contents in their biotite, whereas the Van Canh granitic rocks have low A/CNK ratios and low total Al contents in their biotite. The intrusion of the Ben Giang-Que Son granitic rocks caused high-temperature metamorphism, which decomposed some of the carbon or graphite in the surrounding continental crustal materials, such as clastic sedimentary rocks. Meanwhile, the Van Canh granitic rocks, which intruded later than the Ben Giang-Que Son granitic rocks, incorporated smaller quantities of carbon or graphite in continental crustal materials, resulting in them retaining the chemical characteristics of adakitic, magnetite-series, and I-type granitic rocks, different from the Ben Giang-Que Son granitic rocks. |
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| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T16:48:07Z |
| publishDate | 2023-11-01 |
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| series | Geosciences |
| spelling | doaj.art-a7e2dd1782ff47cab2d482c74f2ed6692023-11-24T14:44:27ZengMDPI AGGeosciences2076-32632023-11-01131134110.3390/geosciences13110341Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, VietnamEtsuo Uchida0Ko Yonezu1Takumi Yokokura2Nasuka Mori3Department of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, JapanDepartment of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, JapanDepartment of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, JapanDepartment of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, JapanPermian Ben Giang-Que Son and Triassic Van Canh granitic rocks are widely distributed across the southern Kontum Massif, the basement of which consists mainly of metasedimentary rocks. The Ben Giang-Que Son granitic rocks are classified as I- to S-type and ilmenite-series granitic rocks, while the Van Canh granitic rocks are classified as I-type and magnetite-series granitic rocks. Both granitic rock suites exhibit more or less adakitic properties, suggesting that the subduction of the high-temperature Song Ma Ocean crust, part of the Paleo-Tethys Ocean, beneath the Indochina Block produced adakitic magma. It is hypothesized that the differences between the two granitic rock suites were caused by differences in the quantities of incorporated continental crustal materials and carbon or graphite in clastic sedimentary rocks when their adakitic magma intruded into the continental crust. Based on their high initial Sr isotope ratios, the Ben Giang-Que Son granitic rocks evidently incorporated a higher quantity of continental crustal materials compared to the Van Canh granitic rocks, resulting in the former showing the signatures of ilmenite-series and I- to S-type granitic rocks. Consequently, the Ben Giang-Que Son granitic rocks have relatively high A/CNK ratios and high total Al contents in their biotite, whereas the Van Canh granitic rocks have low A/CNK ratios and low total Al contents in their biotite. The intrusion of the Ben Giang-Que Son granitic rocks caused high-temperature metamorphism, which decomposed some of the carbon or graphite in the surrounding continental crustal materials, such as clastic sedimentary rocks. Meanwhile, the Van Canh granitic rocks, which intruded later than the Ben Giang-Que Son granitic rocks, incorporated smaller quantities of carbon or graphite in continental crustal materials, resulting in them retaining the chemical characteristics of adakitic, magnetite-series, and I-type granitic rocks, different from the Ben Giang-Que Son granitic rocks.https://www.mdpi.com/2076-3263/13/11/341Van Canh granitic rocksBen Giang-Que Son granitic rocksKontum Massifgeochemical signaturesmagnetic susceptibilitypetrogenesis |
| spellingShingle | Etsuo Uchida Ko Yonezu Takumi Yokokura Nasuka Mori Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam Geosciences Van Canh granitic rocks Ben Giang-Que Son granitic rocks Kontum Massif geochemical signatures magnetic susceptibility petrogenesis |
| title | Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam |
| title_full | Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam |
| title_fullStr | Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam |
| title_full_unstemmed | Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam |
| title_short | Differences in Geochemical Signatures and Petrogenesis between the Van Canh and Ben Giang-Que Son Granitic Rocks in the Southern Kontum Massif, Vietnam |
| title_sort | differences in geochemical signatures and petrogenesis between the van canh and ben giang que son granitic rocks in the southern kontum massif vietnam |
| topic | Van Canh granitic rocks Ben Giang-Que Son granitic rocks Kontum Massif geochemical signatures magnetic susceptibility petrogenesis |
| url | https://www.mdpi.com/2076-3263/13/11/341 |
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