Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains
AbstractCretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents new zircon ages and Sr–Nd–Pb–Hf–O isotopic and whole-rock geochemical data for the Cretaceous granitoids in the Schwaner Mountain...
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| Format: | Article |
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GeoScienceWorld
2022-07-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/8483732/615588/Late-Cretaceous-Nature-of-SW-Borneo-and-Paleo |
| _version_ | 1811177659459174400 |
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| author | Xin Qian Yongqi Yu Yuejun Wang Chengshi Gan Yuzhi Zhang Junaidi Bin Asis |
| author_facet | Xin Qian Yongqi Yu Yuejun Wang Chengshi Gan Yuzhi Zhang Junaidi Bin Asis |
| author_sort | Xin Qian |
| collection | DOAJ |
| description |
AbstractCretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents new zircon ages and Sr–Nd–Pb–Hf–O isotopic and whole-rock geochemical data for the Cretaceous granitoids in the Schwaner Mountains. These granitoid samples yield formation ages of 92–80 Ma and can be geochemically subdivided into Group 1 biotite granite and granodiorite and Group 2 monzogranite. Group 1 has higher εHf t values of +1.2–+14.5 and lower δ18O values of 5.2–6.6‰ than Group 2 with εHf t and δ18O values of −1.5–+5.9 and 6.1–6.6‰, respectively. Group 1 samples show variable εNd t values of −1.9–+1.7, (206Pb/204Pb)i ratios of 18.63–19.29, (207Pb/204Pb)i ratios of 15.62–15.69, and (208Pb/204Pb)i ratios of 38.67–39.49 and are the products of partial melting of newly underplated mafic rocks with a component of crustal rocks. Group 2 with slightly negative εNd t values of −1.1–−1.5 was originated from partial melting of metasedimentary rocks with a juvenile mafic component. These granitoids were formed in a continental arc setting related to the Paleo-Pacific subduction during the Late Cretaceous and can compare with those contemporaneous I-type granites along the Kuching zone in NW Borneo. Those Late Cretaceous granitoids with A-type affinities from the easternmost Peninsular Malaysia and Singapore to the east of Sundaland might be formed in a back-arc extensional setting after the Paleo-Pacific subduction. |
| first_indexed | 2024-04-11T06:05:59Z |
| format | Article |
| id | doaj.art-09316819765145f39612257251e3f6e9 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-11T06:05:59Z |
| publishDate | 2022-07-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-09316819765145f39612257251e3f6e92022-12-22T04:41:30ZengGeoScienceWorldLithosphere1941-82641947-42532022-07-012022110.2113/2022/8483732Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner MountainsXin Qian0http://orcid.org/0000-0002-3587-861XYongqi Yu1Yuejun Wang2Chengshi Gan3Yuzhi Zhang4Junaidi Bin Asis5http://orcid.org/0000-0003-2837-43811 Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Zhuhai 519082 China sysu.edu.cn1 Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Zhuhai 519082 China sysu.edu.cn1 Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Zhuhai 519082 China sysu.edu.cn1 Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Zhuhai 519082 China sysu.edu.cn1 Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Zhuhai 519082 China sysu.edu.cn3 Faculty of Science and Natural Resources Universiti Malaysia Sabah 88400 Kota Kinabalu Sabah Malaysia ums.edu.my AbstractCretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents new zircon ages and Sr–Nd–Pb–Hf–O isotopic and whole-rock geochemical data for the Cretaceous granitoids in the Schwaner Mountains. These granitoid samples yield formation ages of 92–80 Ma and can be geochemically subdivided into Group 1 biotite granite and granodiorite and Group 2 monzogranite. Group 1 has higher εHf t values of +1.2–+14.5 and lower δ18O values of 5.2–6.6‰ than Group 2 with εHf t and δ18O values of −1.5–+5.9 and 6.1–6.6‰, respectively. Group 1 samples show variable εNd t values of −1.9–+1.7, (206Pb/204Pb)i ratios of 18.63–19.29, (207Pb/204Pb)i ratios of 15.62–15.69, and (208Pb/204Pb)i ratios of 38.67–39.49 and are the products of partial melting of newly underplated mafic rocks with a component of crustal rocks. Group 2 with slightly negative εNd t values of −1.1–−1.5 was originated from partial melting of metasedimentary rocks with a juvenile mafic component. These granitoids were formed in a continental arc setting related to the Paleo-Pacific subduction during the Late Cretaceous and can compare with those contemporaneous I-type granites along the Kuching zone in NW Borneo. Those Late Cretaceous granitoids with A-type affinities from the easternmost Peninsular Malaysia and Singapore to the east of Sundaland might be formed in a back-arc extensional setting after the Paleo-Pacific subduction.https://pubs.geoscienceworld.org/lithosphere/article/2022/1/8483732/615588/Late-Cretaceous-Nature-of-SW-Borneo-and-Paleo |
| spellingShingle | Xin Qian Yongqi Yu Yuejun Wang Chengshi Gan Yuzhi Zhang Junaidi Bin Asis Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains Lithosphere |
| title | Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains |
| title_full | Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains |
| title_fullStr | Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains |
| title_full_unstemmed | Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains |
| title_short | Late Cretaceous Nature of SW Borneo and Paleo-Pacific Subduction: New Insights from the Granitoids in the Schwaner Mountains |
| title_sort | late cretaceous nature of sw borneo and paleo pacific subduction new insights from the granitoids in the schwaner mountains |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/8483732/615588/Late-Cretaceous-Nature-of-SW-Borneo-and-Paleo |
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