Journal of Asian Earth Sciences最新文献

{"title":"Petrogenesis of Mesoproterozoic kimberlites in the Chigicherla region, Eastern Dharwar craton, Southern India: Insights into the origin of small-volume, enriched-mantle derived melts and link to subduction and supercontinent cycle","authors":"Hero Kalra ,&nbsp;Ashish Dongre ,&nbsp;Fanus Viljoen ,&nbsp;Qiu-Li Li","doi":"10.1016/j.jseaes.2025.106508","DOIUrl":"10.1016/j.jseaes.2025.106508","url":null,"abstract":"<div><div>We present new mineralogical, elemental and U-Pb perovskite age data for diamondiferous intrusions from Chigicherla kimberlite cluster of the Eastern Dharwar craton (EDC) in southern India. These rocks display inequigranular textures and contain macrocrysts, and segregations of solidified melts which are interpreted to be magmaclasts. Mineralogical studies indicate that intrusions CC-1 and CC-2 show a similarity to Kaapvaal lamproites, while the other three intrusions (CC-3, CC-4, and CC-5) display characteristics indicative of true kimberlite nature. The whole rock major and trace element geochemistry, involving large-ion lithophile and high-field strength elements, supports this observation. The geochemical signatures resembling Ocean Island Basalts (OIB) and metasomatism of source regions by fluids/melts emanating from deep-sourced upwelling mantle are consistent across the Chigicherla intrusions, mirroring other kimberlite intrusions within the EDC. Perovskite dating revealed a ²⁰⁶Pb/²³⁸U age of 1110 ± 9.5 Ma for the CC-1 pipe and 1116 ± 14 Ma for the CC-3 pipe.</div><div>This new data enables us to study the genesis of the Chigicherla intrusions specifically and to propose a new geodynamic model for the eruption of kimberlites and lamproites in southern India in general. The eruptions of predominantly kimberlites between 1055 and 1153 Ma and lamproites between 1300 and 1400 Ma are attributed to processes such as prolonged subduction, lithospheric extension, and mantle return flow, considering the plate tectonic evolution of the EDC during the Mesoproterozoic.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106508"},"PeriodicalIF":2.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraints of clay mineral assemblages on the provenance of sediments in the northern East China Sea with implications for the tectonic activities","authors":"Zhigeng Huang ,&nbsp;Yonghang Xu ,&nbsp;Liang Yi ,&nbsp;Dongyi Li ,&nbsp;Jian Chen","doi":"10.1016/j.jseaes.2025.106512","DOIUrl":"10.1016/j.jseaes.2025.106512","url":null,"abstract":"<div><div>The Zhe-Min Uplift (ZMU) has significantly impacted the geomorphology of eastern China. Due to the geographic barrier created by the ZMU, the transport pathway of sediments from the paleo-Yangtze River to the East China Sea remains unclear. This study presents a high-resolution clay mineralogy analysis of a borehole (ECS-DZ1, 153.6 m) within the ZMU to investigate sediment provenance and paleoenvironmental changes in the northern East China Sea. In the Early Pleistocene, the clay minerals of marine sediments were predominantly illite, with notable contents of smectite (24 %) and kaolinite (12 %), primarily sourced from proximal sources such as the Bailonggang basalt and the Qiantang River. However, with ongoing tectonic subsidence, sediments from the paleo-Yangtze River began to influence the study area during the Early-Middle Pleistocene, leading to a decrease in kaolinite content (6 %). In the terrestrial deposits of core ECS-DZ1, illite is the dominant mineral (68 %), with relatively high kaolinite (12 %) and the absence of smectite, indicating that sediments were primarily derived from the Qiantang River. During the Holocene sea-level highstand, over 50 m of marine sediments accumulated in the Yangtze River estuary, with clay mineral assemblages from this period matching those of the Yangtze River, confirming it as the primary source. The sediment provenance of the East China Sea continental shelf is influenced by the complex interplay of global sea-level fluctuations and tectonic activity.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106512"},"PeriodicalIF":2.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial characteristics and CO2 diffuse emission in the Mt. Changbai volcanic field, northeast China","authors":"Yutao Sun ,&nbsp;Xingxing Li ,&nbsp;Zhengfu Guo ,&nbsp;Wenbin Zhao ,&nbsp;Yue Zhang ,&nbsp;Peizhan Li ,&nbsp;Xiaoyong Zhao ,&nbsp;Yaru Li ,&nbsp;Bin Hong","doi":"10.1016/j.jseaes.2025.106513","DOIUrl":"10.1016/j.jseaes.2025.106513","url":null,"abstract":"<div><div>Volcanism is one of the principal geologic processes that drive the transferring of carbon between interior and surface reservoirs, playing a crucial role in climate change and global warming. Clarifying the relationship between the characteristics of microorganisms and geological degassing of dormant volcanoes is one of the most important and fundamental tasks. In this study, the microbial characteristics (including bacteria, archaea, and fungi) of cold and hot springs and soil in the Tianchi volcano (TCV), northeastern China were comprehensively studied. Results of this study indicated that the microbial diversities of water environments (hot and cold springs) exhibited distinct characteristics compared to that of the soil, inferring that the microbial-driven carbon cycle in wet and dry degassing systems in the TCV are different. The CO₂ diffuse emission flux from the soil through micro-seepage decreased from the crater to the peripheral area, which broadly coincided with the diversity and richness of the microbial community. A moderate but significant correlation was found between soil CO₂ flux and microbial diversity of bacteria, archaea and fungi, differing from that observed in extreme volcanic environments and non-volcanic fields. This study is the first to report the correlation between microbial community diversity and soil CO₂ flux in a non-extreme volcanic environment. The findings reveal the diversity of microorganisms involved in the carbon cycle, which may provide a foundation for further in-depth exploration of the intrinsic microbial mechanisms in the carbon cycle.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106513"},"PeriodicalIF":2.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143358055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Earthquake-induced permeability and hydrochemical variation in an aquifer–aquitard system","authors":"Xiaobo Feng,&nbsp;Zhihua Zhou","doi":"10.1016/j.jseaes.2025.106514","DOIUrl":"10.1016/j.jseaes.2025.106514","url":null,"abstract":"<div><div>Groundwater level, permeability, and chemical components can be affected by earthquakes; however, there are few comprehensive investigations utilizing long-term continuous hydrological monitoring data covering multiple strong earthquakes. In this study, a continuous 2-year dataset of groundwater levels and chemical composition (Ca²⁺, Mg²⁺, HCO₃⁻) from well #32 in the Xichang area of Sichuan Province, China, was used to analyze changes in earthquake-induced hydrological processes within an aquifer–aquitard system. Co-seismic changes in groundwater level and ion concentrations were associated with the Yangbi <em>M</em>_W 6.1 and Luding <em>M</em>_W 6.6 earthquakes. Horizontal and vertical permeability, estimated using the tidal response model, decreased during both earthquakes, possibly owing to dynamic strain resulting from seismic waves. In addition, there were significant correlations between vertical permeability and ion concentrations, with ion fluctuations during earthquake periods possibly associated with reduced mixing of different groundwater sources owing to the decrease in permeability. The results of this study provide new insight into the role of earthquakes in dynamic hydrological processes.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106514"},"PeriodicalIF":2.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143358054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical characteristics of hot springs in the Longriba fault, northeastern Tibetan Plateau: Tectonic implications for geothermal fluid circulation","authors":"Yuwen Wang ,&nbsp;Xiaocheng Zhou ,&nbsp;Jingchao Li ,&nbsp;Yunfei Bai ,&nbsp;Yucong Yan ,&nbsp;Jiao Tian ,&nbsp;Miao He ,&nbsp;Zhaojun Zeng ,&nbsp;Bingyu Yao ,&nbsp;Gaoyuan Xing ,&nbsp;Shihan Cui ,&nbsp;Ying Li ,&nbsp;Liwu Li","doi":"10.1016/j.jseaes.2025.106511","DOIUrl":"10.1016/j.jseaes.2025.106511","url":null,"abstract":"<div><div>The Longriba fault (LRBF) is in the seismically active northeastern Tibetan Plateau, yet the tectonic dynamics at the fault remain controversial. Furthermore, no studies have provided insights into tectonic activity through geothermal fluid circulation in the LRBF. In this study, we investigated 20 hot springs in the LRBF to get a better understanding of the processes and control factors between fluid circulation and tectonic activity. Hydrogeochemical results indicate that the hot springs in the study area are predominantly recharged by atmospheric precipitation and can be classified into two groups based on their hydrochemical types. Group I was a typical HCO₃-Ca, including some HCO₃-Ca⋅Mg, HCO₃-Mg, and HCO₃-Na⋅Ca. Group II hot springs, classified as HCO₃-Na type, have high reservoir temperatures (average 94 °C), suggesting dominant reactions with silicates during deep circulation. Meanwhile, the hydrogen, oxygen, and strontium isotopes of water in the two groups also show significant differences. In addition, the Group II hot springs are all located in the southwest segment of the study area, and their gases have higher ³He/⁴He ratios (Rc/Ra ratios up to 0.43 Ra). Hydrogeochemical results, combined with geological and geophysical data, suggest that differences in recharge elevation, granite distribution, and potential lower crustal flow or partial melting contributed to the distinct hydrogeochemical characteristics of the two groups. Moreover, we supposed that the spatial distribution of ³He/⁴He implies a lower crustal flow and partial melting beneath the LRBF. One possible explanation is the presence of a lower crustal flow tributary beneath the LRBF. In the LRBF, hydrothermal circulation and deep tectonics are likely key factors in generating high-frequency earthquakes. The above results provide insights into regional tectonic activity through the hydrogeochemical characteristics of hot springs.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106511"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active tectonics and kinematic architecture of intraplate strike-slip fault: Savrun fault zone, SE Türkiye","authors":"Şule Gürboğa","doi":"10.1016/j.jseaes.2025.106509","DOIUrl":"10.1016/j.jseaes.2025.106509","url":null,"abstract":"<div><div>Türkiye is a unique country whose deformation pattern has been formulated in terms of three main plates Eurasia, Africa, Arabia and microplate Anatolian that are actively moving in recent time. This variety creates a giant fault network defining the plate boundaries and intraplate faults. Savrun Fault Zone (SFZ) is one of the intraplate strike-slip faults near west of the 2023 earthquakes area and many controversies have arisen about its activeness. In this study, it is investigated and reported on the geometric, structural, and kinematic characteristics of the SFZ based on field measurements of fault-slip data. At least two different deformation phases have been recognized in the geological evolution of the SFZ; older NNE-SSW compressional tectonic up to Middle Pliocene and the youngest strike-slip regime created by N-S compression and E-W extensional direction. According to the results, SFZ is a reactivated reverse fault and its the present-day configuration is an active sinistral strike-slip architecture comprising three segments (north, middle and east) and two contractional stepovers reflecting strong geomorphic indicators marked by strike parallel fault valley.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106509"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Velocities and strain rates in the Baikal-Mongolia region from the GNSS data","authors":"A.V. Lukhnev,&nbsp;V.A. Sankov,&nbsp;A.I. Miroshnichenko,&nbsp;L.M. Byzov,&nbsp;A.V. Sankov,&nbsp;O.F. Lukhneva","doi":"10.1016/j.jseaes.2025.106500","DOIUrl":"10.1016/j.jseaes.2025.106500","url":null,"abstract":"<div><div>We carried out study crustal deformations in the Baikal-Mongolian area as a key Indo-Asian collision zone including kinematic, geodynamic, and active tectonic aspects. The GNSS measurement data over the last 29 years formed the basis for calculating vectors of horizontal tectonic movements at a qualitatively new level. Recent results show the southeastern movement of the Trans-Baikal sites at an average velocity of 2 mm yr⁻¹.</div><div>We calculated the most realistic velocity of the opening of the Baikal Rift are of 0.9 ± 0.1 mm year⁻¹. On the basic long-term measurements we are computed the parameters of the rotation pole of the Siberian block (φ.: 53.107°; λ.: −99.793°; Mg.: 0.249282° Myr⁻¹).</div><div>The maximum values of area extension rates are mainly confined to the central parts of the Baikal rift and the Tunka depression. The amplitudes of the relative deformation extension exceed 20 × 10^-9 yr⁻¹.</div><div>The strain rate analysis also provided an opportunity to distinguish three deformation domains – contraction-, extension- and transition-dominated. Narrow zones identified between the extension- and contraction-dominated deformation domains are confined to large seismic events therein. Transitional zones are found in the central Mongolia, Transbaikalia and Tuva, with dilatation rates ranging from −5 to 5 × 10^-9 yr⁻¹.</div><div>A sharp positive to negative dilatation transition boundary is associated with recent significant seismic events.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106500"},"PeriodicalIF":2.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143173344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of Late Triassic lamprophyres in the western Yanshan Tectonic Belt related to destruction of the North China Craton: Geochronological and geochemical constraints","authors":"Zhuang Li ,&nbsp;Guochun Zhao ,&nbsp;Bin Chen ,&nbsp;Mingshuo Qin","doi":"10.1016/j.jseaes.2025.106504","DOIUrl":"10.1016/j.jseaes.2025.106504","url":null,"abstract":"<div><div>Lamprophyres, ultrapotassic igneous rocks generally derived from the melting of enriched subcontinental lithospheric mantle, typically form in extensional tectonic settings and are associated with coeval transcrustal processes. The genesis of lamprophyres provides insights into the generation, storage, and emplacement of lamprophyric magmas, and further constrains the nature of mantle sources. However, the origin of lamprophyres remains enigmatic and requires further investigation. The Late Triassic lamprophyres along the western Yanshan Tectonic Belt of the northern North China Craton (NCC) offer a key opportunity to understand the tectonic evolution of this region, particularly their relationship with the onset of craton destruction. Here we report the results of an integrated geochronological and geochemical study of Late Triassic lamprophyres and quartz monzonite porphyries in Beijing on the western Yanshan Tectonic Belt. U–Pb zircon dating using LA–ICP–MS reveals that the lamprophyres and quartz monzonite porphyries were emplaced contemporaneously during <em>ca.</em> 235–220 Ma, marking a Late Triassic magmatic event in the northern NCC. The Late Triassic lamprophyre and quartz monzonite porphyry sills are enriched in large ion lithophile elements (LILEs) and light rare earth elements (LREEs) but are depleted in high field strength elements (HFSEs), exhibiting arc-like geochemical characteristics. They also display high MgO and total alkali concentrations with low silica contents. Unradiogenic whole-rock Nd and Hf isotope compositions [(ε_Nd(t) = −11.3 to −10.8) and (ε_Hf(t) = −16.3 to −12.5)] indicate that the magmas of the Triassic suite were likely derived from an enriched lithospheric mantle source, followed by fractional crystallization of ferromagnesian phases and minor crustal assimilation. Geochemical modeling suggests that the parental magma of the lamprophyres was generated through a low degree (&lt;5 %) partial melting of spinel–garnet lherzolites. These results suggest that the investigated rocks originated from a subcontinental lithospheric mantle enriched by fluid and/or melt metasomatism, likely during subduction of the Paleo-Asian oceanic plate beneath the NCC. Radiogenic zircon Hf isotope compositions [e.g., ε_Hf(t) = 6.4 to 8.9] of the Late Triassic lamprophyres point to the involvement of a depleted mantle source. The upwelling of the asthenosphere, triggered by intensive intra-continental extension during the Triassic, likely provided the heat required to melt the enriched subcontinental lithosphere beneath the NCC. This Late Triassic interaction between the asthenosphere and the lithospheric mantle marks the onset of NCC destruction and contributed to its thermo-mechanical erosion.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106504"},"PeriodicalIF":2.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic activity characteristics of the Tongkuang Shan fault (Southeastern Tian Shan, China) revealed by high-resolution topographic data","authors":"Hui Qiu ,&nbsp;Haiyun Bi ,&nbsp;Wenjun Zheng ,&nbsp;Jiangyuan Zeng ,&nbsp;Bingxu Liu ,&nbsp;Shiqi Wei","doi":"10.1016/j.jseaes.2025.106505","DOIUrl":"10.1016/j.jseaes.2025.106505","url":null,"abstract":"<div><div>With the rapid development of remote sensing technology, it is getting easier to obtain high-resolution topographic data, which is of great significance for quantitative investigations of active tectonics, particularly in inaccessible regions. The Tongkuang Shan Fault is a thrust fault located within the Yanqi Basin in the southeastern Tian Shan Mountain, and can be divided into the west and east segment based on the fault geometry. Although obvious fault scarps have developed along the fault, its activity has rarely been investigated since most part of the fault is located in a closed military area. In this study, the Worldview satellite stereoscopic images were utilized to create a 0.5 m resolution Digital Elevation Model (DEM) and orthoimage of the Tongkuang Shan Fault. Based on the high-resolution topographic data, we interpreted the geometric structure of the fault, classified the different geomorphic units, and measured the vertical displacements along the fault. A total of 296 vertical displacements were measured on different geomorphic surfaces along the fault trace. The results show six distinct clusters in the distribution of vertical displacements along the fault, with peak values at 1.4 ± 0.4/1.5 ± 0.5 m, 3.0 ± 0.7/3.4 ± 0.6 m, 5.7 ± 0.9/5.5 ± 0.7 m, 8.9 ± 1.2/8.2 ± 1.3 m, 15.4 ± 1.0/16.2 ± 0.9 m, and 28.3 ± 1.8/26.5 ± 1.5 m on the west and east segment, respectively, which are in good agreement with the vertical displacements acquired from different geomorphic units, indicating a multiple phase of activity on the fault. The fault may have undergone at least six strong paleoseismic events, and the smallest displacement cluster (1.4 ± 0.4/1.5 ± 0.5 m) is considered to be the coseismic displacement of the most recent event, yielding an earthquake magnitude of approximately M_w 7.0–7.2. Moreover, the coefficient of variation of the first four peak displacements are 0.39 and 0.24 for the two segments, indicating a high repeatability of paleoseismic displacements on the fault, potentially conforming to a characteristic earthquake model.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106505"},"PeriodicalIF":2.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143173387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Eocene to Pliocene magmatic evolution and its association with gold mineralization in central western Sulawesi, Indonesia","authors":"Renaldi Suhendra ,&nbsp;Andrea Agangi ,&nbsp;Ryohei Takahashi ,&nbsp;Marlina A. Elburg ,&nbsp;Muhammad Zain Tuakia ,&nbsp;Hartaja Wicaksono ,&nbsp;Hinako Sato ,&nbsp;Iwan Setiawan","doi":"10.1016/j.jseaes.2025.106506","DOIUrl":"10.1016/j.jseaes.2025.106506","url":null,"abstract":"<div><div>Late Eocene and late Miocene–Pliocene magmatism in central western (CW) Sulawesi were defined by the U-Pb ages of magmatic zircon from the intrusive rocks. The late Eocene magmatism formed diorite and granitoid with hornblende-rich, calc-alkaline, and medium- to high-K compositions, derived from hydrous (av. 5.6 wt% H₂O) and oxidized I-type intermediate to felsic magmas. The late Miocene–Pliocene magmatism formed gabbro and granitoid. The granitoid is biotite-rich, calc-alkaline, and high-K composition, derived from hydrous (av. 8.4 wt% H₂O) and reduced I-type felsic magma. Negative anomalies of Nb, Ta, and Ti, and positive anomalies of K and Pb in the primitive mantle normalized trace element plots of the late Eocene hornblende-rich diorite and granitoid suggest formation in a subduction-related setting. The late Miocene–Pliocene gabbro formed by partial melting of upper mantle with minimal crustal contribution, whereas the granitoid formed through the reworking of previous subduction-related rocks during post-subduction regional extension. These are suggested by the occurrence of late Eocene inherited zircon grains in the late Miocene–Pliocene gabbro and granitoid and by similar trace element anomalies between biotite-rich granitoids and late Eocene diorite–granitoid. We observed that the oxidation state of magma strongly influences associated Au mineralization. The intrusion-related Fe-oxide-Au mineralization in the Awak Mas deposit is genetically linked to either late Eocene or previously reported middle Miocene oxidized I-type dioritic and granitic intrusions. Conversely, the intrusion-related base metal-Au-type mineralization in the Palopo and Esang prospects is associated with the late Miocene–Pliocene reduced I-type granitic intrusions.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106506"},"PeriodicalIF":2.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}