Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo
AbstractThe EW-trending Kuching zone in Borneo is a target region for exploring the southern continuation of Paleo-Pacific subduction from South China, Vietnam to SE Asia. Previous studies mainly focused on mafic igneous rocks, and poor attention has been paid to the contemporaneous...
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-05-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/3310613/613501/Late-Cretaceous-Granitoids-along-the-Northern |
| _version_ | 1811237209611698176 |
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| author | Chengshi Gan Xin Qian Yuejun Wang Qinglai Feng Yuzhi Zhang Junaidi Bin Asis |
| author_facet | Chengshi Gan Xin Qian Yuejun Wang Qinglai Feng Yuzhi Zhang Junaidi Bin Asis |
| author_sort | Chengshi Gan |
| collection | DOAJ |
| description |
AbstractThe EW-trending Kuching zone in Borneo is a target region for exploring the southern continuation of Paleo-Pacific subduction from South China, Vietnam to SE Asia. Previous studies mainly focused on mafic igneous rocks, and poor attention has been paid to the contemporaneous granitoids in this zone. This study presented detailed zircon U-Pb geochronology and Lu-Hf isotope and whole-rock geochemistry analyses for late Cretaceous granitoids (granodiorites and granites) in the northern Kuching zone. These granitoids are dated at ~77.5-83.6 Ma with younger ages than the igneous rocks in the southern Kuching zone (~130-144 Ma). The granitoids have variable SiO2 (64.86-77.37 wt.%) and A/CNK (0.7-1.5) and are strongly enriched in LILE and depleted in HFSE with significant Ba, Nb, Sr, and Ti negative anomalies. They have variable (87Sr/86Sr)i (from 0.70656 to 0.71208), εNd(t) (from -4.4 to +0.9), and zircon εHf(t) (from -1.2 to +12.4) with high (206Pb/204Pb)i ratio of 18.78-19.74, suggesting derivation from a hybrid source involving meta-sedimentary and meta-igneous rocks. Combined with previously-published data, two episodes of Cretaceous (~77-98 Ma and ~130-144 Ma) magmatic activities are identified in the Kuching zone, showing a younging age trend from south to north. These episodes of Cretaceous igneous rocks and their spatial distribution in the Kuching zone can be totally comparable to those in South China and Vietnam. Thus, the Kuching zone was likely a part of the Paleo-Pacific subduction system during the Cretaceous, northerly linking to Vietnam and South China. |
| first_indexed | 2024-04-12T12:22:05Z |
| format | Article |
| id | doaj.art-614a6d37916b4edca3d2cb61761ae974 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-12T12:22:05Z |
| publishDate | 2022-05-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-614a6d37916b4edca3d2cb61761ae9742022-12-22T03:33:17ZengGeoScienceWorldLithosphere1941-82641947-42532022-05-012022110.2113/2022/3310613Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in BorneoChengshi Gan0Xin Qian1http://orcid.org/0000-0002-3587-861XYuejun Wang2Qinglai Feng3Yuzhi Zhang4Junaidi Bin Asis5Guangdong Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Guangzhou 510275 China sysu.edu.cnGuangdong Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Guangzhou 510275 China sysu.edu.cnGuangdong Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Guangzhou 510275 China sysu.edu.cnState Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Wuhan 430074 China cug.edu.cnGuangdong Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-sen University Guangzhou 510275 China sysu.edu.cnFaculty of Science and Natural Resources Universiti Malaysia Sabah 88400 Kota Kinabalu Sabah Malaysia ums.edu.my AbstractThe EW-trending Kuching zone in Borneo is a target region for exploring the southern continuation of Paleo-Pacific subduction from South China, Vietnam to SE Asia. Previous studies mainly focused on mafic igneous rocks, and poor attention has been paid to the contemporaneous granitoids in this zone. This study presented detailed zircon U-Pb geochronology and Lu-Hf isotope and whole-rock geochemistry analyses for late Cretaceous granitoids (granodiorites and granites) in the northern Kuching zone. These granitoids are dated at ~77.5-83.6 Ma with younger ages than the igneous rocks in the southern Kuching zone (~130-144 Ma). The granitoids have variable SiO2 (64.86-77.37 wt.%) and A/CNK (0.7-1.5) and are strongly enriched in LILE and depleted in HFSE with significant Ba, Nb, Sr, and Ti negative anomalies. They have variable (87Sr/86Sr)i (from 0.70656 to 0.71208), εNd(t) (from -4.4 to +0.9), and zircon εHf(t) (from -1.2 to +12.4) with high (206Pb/204Pb)i ratio of 18.78-19.74, suggesting derivation from a hybrid source involving meta-sedimentary and meta-igneous rocks. Combined with previously-published data, two episodes of Cretaceous (~77-98 Ma and ~130-144 Ma) magmatic activities are identified in the Kuching zone, showing a younging age trend from south to north. These episodes of Cretaceous igneous rocks and their spatial distribution in the Kuching zone can be totally comparable to those in South China and Vietnam. Thus, the Kuching zone was likely a part of the Paleo-Pacific subduction system during the Cretaceous, northerly linking to Vietnam and South China.https://pubs.geoscienceworld.org/lithosphere/article/2022/1/3310613/613501/Late-Cretaceous-Granitoids-along-the-Northern |
| spellingShingle | Chengshi Gan Xin Qian Yuejun Wang Qinglai Feng Yuzhi Zhang Junaidi Bin Asis Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo Lithosphere |
| title | Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo |
| title_full | Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo |
| title_fullStr | Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo |
| title_full_unstemmed | Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo |
| title_short | Late Cretaceous Granitoids along the Northern Kuching Zone: Implications for the Paleo-Pacific Subduction in Borneo |
| title_sort | late cretaceous granitoids along the northern kuching zone implications for the paleo pacific subduction in borneo |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/3310613/613501/Late-Cretaceous-Granitoids-along-the-Northern |
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