IF 5.8 1区地球科学

Geology Pub Date : 2026-07-09 DOI: 10.1130/g54368.1

Huan Chen, Richen Zhong, Yuling Xie, Xinfu Zhao, Joël Brugger, Hao Cui, Chang Yu, Mojie Li

引用次数: 0

Middle Pleistocene (>350 ka) glaciation in the Carpathians unveiled by quartz microtextures from cave sediments (Low Tatra Mountains, Slovakia) 喀尔巴阡山脉中更新世（bb0 ~ 350 ka）冰川作用：洞穴沉积物的石英显微结构揭示（斯洛伐克低塔特拉山脉）

IF 5.8 1区地球科学

Geology Pub Date : 2026-07-08 DOI: 10.1130/g54825.1

Dawid Siemek, Jacek Szczygieł, Barbara Woronko, Juraj Littva, Pavel Bella, Piotr Kłapyta

引用次数: 0

Presubduction heavy Mg isotope enrichment in the sub-arc mantle 弧下地幔俯冲前重Mg同位素富集

IF 5.8 1区地球科学

Geology Pub Date : 2026-07-06 DOI: 10.1130/g54265.1

Yuxiang Zhang, Yi-Xiang Chen, Zuxing Chen, Fang Huang, Maoyong He, Zhigang Zeng

{"title":"Presubduction heavy Mg isotope enrichment in the sub-arc mantle","authors":"Yuxiang Zhang, Yi-Xiang Chen, Zuxing Chen, Fang Huang, Maoyong He, Zhigang Zeng","doi":"10.1130/g54265.1","DOIUrl":"https://doi.org/10.1130/g54265.1","url":null,"abstract":"Arc lavas with heavier magnesium (Mg) isotope ratios (denoted as δ26Mg) compared to mid-ocean-ridge basalt (MORB) are commonly attributed to the involvement of subducted serpentinite. However, this hypothesis is challenged by the widespread absence of high-δ26Mg serpentinite in the subducting plates beneath Pacific arcs and fails to consider potential δ26Mg heterogeneity in ambient arc mantle. Here, we show that backarc lavas from the Mariana and Ryukyu subduction zones have MORB-like boron (B) isotope compositions and B/Nb ratios, indicative of little subducted serpentinite in their source. Such lavas have similarly high δ26Mg as their arc counterparts, suggesting the ambient arc mantle in this area is intrinsically rich in isotopically heavy Mg. Further analysis of metaserpentinites demonstrates that deserpentinization residues inherit protolith δ26Mg without significant isotope fractionation during dehydration, highlighting the important contribution of deserpentinized peridotite to the high-δ26Mg mantle. We propose that the high-δ26Mg arc lavas are not necessarily related to ongoing serpentinite subduction, especially in fast-spreading ridge systems. On the other hand, long-term recycling of ancient high-δ26Mg serpentinite provides one plausible mechanism for the heavy Mg mantle domain identified beneath the arc systems. This potentially widespread domain in the mantle greatly affects long-term Mg recycling and crust-mantle evolution.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"22 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148415187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meteoritic and hydrothermal sources of reduced phosphorus in the early Archean 太古宙早期还原磷的陨石和热液来源

IF 5.8 1区地球科学

Geology Pub Date : 2026-06-25 DOI: 10.1130/g54384.1

Joanna Kalita, Abu S. Baidya, Nadja Drabon, Eva E. Stüeken

引用次数: 0

Independent evolution of Gondwana terranes along its northern margin during early Tethyan initiation 特提斯早期形成时期冈瓦纳地体沿其北缘的独立演化

IF 5.8 1区地球科学

Geology Pub Date : 2026-06-02 DOI: 10.1130/g54872.1

Mingjun Zheng, Jun Deng, Yongjun Lu, Huanchao Xu, Jiale Wang, Yingjie Wang, Xianyi Huang, Ke Miao, Xiang Sun

{"title":"Independent evolution of Gondwana terranes along its northern margin during early Tethyan initiation","authors":"Mingjun Zheng, Jun Deng, Yongjun Lu, Huanchao Xu, Jiale Wang, Yingjie Wang, Xianyi Huang, Ke Miao, Xiang Sun","doi":"10.1130/g54872.1","DOIUrl":"https://doi.org/10.1130/g54872.1","url":null,"abstract":"The late Ediacaran−early Paleozoic (580−420 Ma) represents a critical interval marked by the final Gondwana assembly and initiation of the Tethyan realm. The Lhasa terrane (southwestern China) is commonly regarded as part of the Indo-Australian margin tectonic system, yet its paleogeographic affinity and tectono-magmatic evolution remain debated. Here we present a systematic comparison of geological records from the Lhasa terrane with those from the South Qiangtang, Himalaya, and Sibumasu terranes as well as the Iran-Anatolia region. Our results reveal significant differences in tectono-magmatic evolution among terranes along the northern margin of Gondwana. The Lhasa terrane records a prolonged subduction-related history from 580 to 480 Ma, comparable to that of the Iran-Anatolia region, including low-angle subduction at 570−525 Ma, slab rollback at 525−510 Ma, and terrane accretion accompanied by slab break-off at 510−480 Ma. In contrast, terranes along the Indo-Australian margin record a coherent two-stage evolution, with 550−520 Ma ocean-island basalt−like magmatism related to the postcollisional extension stage of the Kuunga-Pinjarra orogen, followed by 500−420 Ma arc-backarc magmatism linked to Proto-Tethyan subduction. These contrasts demonstrate that the Lhasa terrane was not part of the Indo-Australian margin but evolved independently along the African margin of Gondwana, an interpretation further supported by metamorphic and detrital-zircon evidence. Our results refine the geodynamic framework of early Tethyan evolution, provide new constraints on the paleogeographic reconstruction of East Asian blocks, and offer insight into the spatial heterogeneity of Phanerozoic tin mineralization.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"170 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148289493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combining microstructural analysis and in situ apatite−zircon U−Pb LA-ICP-MS to date fluid flow in world-class orogenic gold deposits: A case study from Oko West, Guyana 结合显微结构分析和原位磷灰石-锆石U - Pb LA-ICP-MS测定世界级造山带金矿的流体流动：以圭亚那Oko West为例

IF 5.8 1区地球科学

Geology Pub Date : 2026-05-18 DOI: 10.1130/g54282.1

Pierre-Jean Hainque, Emilie Janots, Pierre Trap, Maxime Bertauts, Julien Leger, Dennis Lahondès, Etienne Le Goff, Brice Lacroix

{"title":"Combining microstructural analysis and in situ apatite−zircon U−Pb LA-ICP-MS to date fluid flow in world-class orogenic gold deposits: A case study from Oko West, Guyana","authors":"Pierre-Jean Hainque, Emilie Janots, Pierre Trap, Maxime Bertauts, Julien Leger, Dennis Lahondès, Etienne Le Goff, Brice Lacroix","doi":"10.1130/g54282.1","DOIUrl":"https://doi.org/10.1130/g54282.1","url":null,"abstract":"Determining the timing of mineralization in orogenic gold systems is a major challenge, given the difficulty of constraining fluid flow events and linking them to gold enrichment. However, it is critical for assessing whether world-class gold deposits result from a single mineralizing event or a multi-stage Au mobilization. In Paleoproterozoic settings, minerals suitable for precise dating of fluid flow are rare, and relying solely on intrusion-related geochronology may prove insufficient. In this context, combining detailed microstructural analysis with petrochronological data provides valuable insights into the tectonic and metallogenic evolution of deposits. In situ U−Pb dating was conducted on both zircon and apatite to investigate the timing of magmatism, deformation, and gold mineralization at Oko West, Guyana. Zircon and apatite ages from intrusive bodies indicate a magmatic event at ca. 2125 Ma, with apatite yielding the same age as that of zircon. Interpretation of the apatite U−Pb data set from mineralized volcano-sedimentary rocks was integrated with microstructural constraints on deformation and fluid flow. Apatite associated with metamorphic fluids and gold-bearing sulfidation records two successive stages at ca. 2100 Ma and ca. 2065 Ma, respectively. The clear temporal gap between the intrusion and the second mineralization stage supports the interpretation of at least two distinct geological events, the latter associated with post-magmatic gold mobilization. These results highlight the suitability of apatite U−Pb geochronology for resolving multi-stage gold deposition during the Rhyacian.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"32 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148290042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enigmatic postsubduction lavas from a fossil slab remnant beneath Baja California, Mexico 神秘的后俯冲熔岩从化石板遗迹下加利福尼亚，墨西哥

IF 5.8 1区地球科学

Geology Pub Date : 2026-04-28 DOI: 10.1130/g53817.1

James K. Muller, Emily J. Chin

{"title":"Enigmatic postsubduction lavas from a fossil slab remnant beneath Baja California, Mexico","authors":"James K. Muller, Emily J. Chin","doi":"10.1130/g53817.1","DOIUrl":"https://doi.org/10.1130/g53817.1","url":null,"abstract":"Geochemically unusual, low-volume lavas have erupted along the Baja California Peninsula (BCP) in Mexico since the Miocene. These rocks have remarkably high Sr contents and Sr/Y ratios. High-Sr/Y magmas are commonly ascribed to partial melting of subducting young oceanic crust (adakites) or melting of mantle previously metasomatized by slab melts (bajaites). However, BCP adakites and bajaites erupted after Farallon plate subduction ended locally. We leverage a novel approach to studying the Baja Californian adakites by combining phase equilibria and trace element modeling. Our calculated melts of a relict slab fragment (imaged geophysically beneath the BCP) are consistent with the trace element compositions of local adakites but only at high pressures when residues comprise garnet-bearing eclogite. We infer the high thermal regime needed to melt the fossil slab and overlying metasomatized mantle may originate via shear heating, sub-slab mantle flow, or a combination thereof. Recent studies have invoked slab melting to reconcile geochemical mass balance at active arcs. The high-Sr/Y BCP lavas may offer a unique, isolated view into this slab-derived component because dominant flux melting overwhelms such a signal in active subduction zones.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"31 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147756195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heavy rains inflate Mount Fuji, central Japan 暴雨使日本中部的富士山膨胀

IF 5.8 1区地球科学

Geology Pub Date : 2026-04-28 DOI: 10.1130/g54450.1

Shuo Zheng, Kosuke Heki, Jianli Chen, Yuki Tamada, Zizhan Zhang, Haoming Yan

引用次数: 0

Nanoscale proteinaceous residues in a Mars-analogous secondary mineral assemblage: Implications for Mars sample return 类似火星的次级矿物组合中的纳米级蛋白质残基：对火星样品返回的影响

IF 5.8 1区地球科学

Geology Pub Date : 2026-04-24 DOI: 10.1130/g54303.1

Qian Fang, Anbei Deng, Jiaming Yang, Liao Yang, Hanlie Hong, Peifeng Xie, Ke Gao, Chen Liu, Xincheng Qiu, Hao Yang, Yu Pei, Anhuai Lu, Zhong-Qiang Chen

{"title":"Nanoscale proteinaceous residues in a Mars-analogous secondary mineral assemblage: Implications for Mars sample return","authors":"Qian Fang, Anbei Deng, Jiaming Yang, Liao Yang, Hanlie Hong, Peifeng Xie, Ke Gao, Chen Liu, Xincheng Qiu, Hao Yang, Yu Pei, Anhuai Lu, Zhong-Qiang Chen","doi":"10.1130/g54303.1","DOIUrl":"https://doi.org/10.1130/g54303.1","url":null,"abstract":"Secondary minerals, such as clay minerals and Fe-Mn oxides, commonly form through aqueous processes mediated by microbial activity, making them key biosignature targets. Microbial proteins can be preserved within these minerals. Although Mars return samples are expected to be rich in secondary phases, the nanoscale distribution and preservation of proteins within them remain poorly known. Using atom probe tomography combined with complementary techniques, we investigate natural Mars-analog secondary minerals and their protein preservation capacity. We achieve in situ, near-atomic-scale characterization of protein-mineral interactions in natural samples. Our results show that clay minerals and Fe-Mn oxides form intimately mixed assemblages with homogeneous spatial associations at the nanometer to subnanometer scale. Proteinaceous residues are preserved within these minerals, commonly distributed along the inner and outer edges of relatively large mineral grains. Incorporation into the mineral lattice likely contributes to their preservation. In contrast, smaller secondary mineral grains (&lt;5 nm) generally retain little protein-related signal and may adsorb only limited amino acid fragments. These findings provide direct nanoscale insights into protein-mineral associations in natural settings, with important implications for detecting potential biosignatures in extraterrestrial samples, such as those returned from Mars.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"429 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147753039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheological contrast traps and controls MW 6.8 Michilla (northern Chile) intraslab aftershocks 流变对比捕获并控制了里氏6.8级Michilla（智利北部）岩壁内余震

IF 5.8 1区地球科学

Geology Pub Date : 2026-04-24 DOI: 10.1130/g53833.1

Francisco Pastén-Araya, Sebastián Carrasco, Catalina Morales-Yáñez, Efraín Rivera, Leoncio Cabrera, Sergio Ruiz, Pablo Salazar

{"title":"Rheological contrast traps and controls MW 6.8 Michilla (northern Chile) intraslab aftershocks","authors":"Francisco Pastén-Araya, Sebastián Carrasco, Catalina Morales-Yáñez, Efraín Rivera, Leoncio Cabrera, Sergio Ruiz, Pablo Salazar","doi":"10.1130/g53833.1","DOIUrl":"https://doi.org/10.1130/g53833.1","url":null,"abstract":"The factors controlling the extent and distribution of aftershocks in intermediate-depth earthquakes remain poorly understood, largely due to the scarcity of dense seismological networks and high-resolution seismic catalogs. Between 2013 and 2015 CE, a temporary dense seismic network installed in northern Chile allowed the detailed monitoring of a peculiar, long-lasting aftershock sequence confined within the rupture zone of the 16 December 2007 MW 6.8 Michilla intermediate-depth earthquake, located within the subducting oceanic plate. This unique dataset allowed us to compile a high-resolution seismic catalog and to analyze the possible factors that influence this type of rupture. Our results show that seismicity was trapped between the upper and lower oceanic crust, correlating strongly with expected dehydration reactions in basaltic and gabbroic rheologies. In addition, aftershocks were distributed across a complex multi-fault system, which can remain active for an extended period through the same dehydration process. These observations provide new constraints on the mechanics of intermediate-depth rupture and highlight the role of dehydration-driven processes in controlling their seismic behavior, with implications for seismic hazard in subduction zones.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"41 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147753013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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