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The Fagradalsfjall and Sundhnúkur Fires of 2021–2024: A single magma reservoir under the Reykjanes Peninsula, Iceland? 2021-2024 年的 Fagradalsfjall 大火和 Sundhnúkur 大火：冰岛雷克雅未克半岛下的单一岩浆库？
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-06-26 DOI: 10.1111/ter.12733
Valentin R. Troll, Frances M. Deegan, Thor Thordarson, Ari Tryggvason, Lukáš Krmíček, William M. Moreland, Björn Lund, Ilya N. Bindeman, Ármann Höskuldsson, James M. D. Day
{"title":"The Fagradalsfjall and Sundhnúkur Fires of 2021–2024: A single magma reservoir under the Reykjanes Peninsula, Iceland?","authors":"Valentin R. Troll, Frances M. Deegan, Thor Thordarson, Ari Tryggvason, Lukáš Krmíček, William M. Moreland, Björn Lund, Ilya N. Bindeman, Ármann Höskuldsson, James M. D. Day","doi":"10.1111/ter.12733","DOIUrl":"https://doi.org/10.1111/ter.12733","url":null,"abstract":"The Reykjanes Peninsula (RP) hosts several volcanic lineaments that have been periodically active over the last 4000 years. Since 2021, following a ca. 800‐year quiescence, eight eruptions have occurred on the RP, with more expected in the future. To better understand the origins of this renewed volcanism and help forecast future eruptions, we examine (i) if the ongoing volcanism is fed from a single or multiple magma storage zone(s) or from several smaller reservoirs and; (ii) where the zone(s) are located (i.e. mantle or lower or upper crustal depths). Using major and trace element geochemistry, oxygen isotopes, and seismic tomography we rule out a single, RP‐scale, deep‐seated magma storage zone. Instead we propose the presence of a ca. 10‐km‐wide region of crustal‐level (9–12 km) magma accumulation beneath the Fagradalsfjall volcanic lineament that fed both the 2021–23 eruptions of the Fagradalsfjall Fires and the 2023–24 eruptions of the Sundhnúkur Fires.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529694","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}
引用次数: 0
Ambient noise tomography reveals complex crustal structure beneath eastern and northeastern Tibet: Insight‐ into regional crustal flow 环境噪声断层扫描揭示了西藏东部和东北部地下复杂的地壳结构：洞察区域地壳流动
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-06-22 DOI: 10.1111/ter.12736
Tengfei Wu, Chenyang Zou, Yujin Hua, Meng Chen
{"title":"Ambient noise tomography reveals complex crustal structure beneath eastern and northeastern Tibet: Insight‐ into regional crustal flow","authors":"Tengfei Wu, Chenyang Zou, Yujin Hua, Meng Chen","doi":"10.1111/ter.12736","DOIUrl":"https://doi.org/10.1111/ter.12736","url":null,"abstract":"We present a 3‐D crustal S‐wave velocity (Vs) model for eastern and northeastern Tibet utilizing ambient noise tomography. Our model reveals that crustal flow channels are absent in northeastern Tibet. In this region, the Kunlun Fault (KLF) significantly impacts mid‐lower crust low‐Vs anomalies. In addition, isolated low‐Vs anomalies beneath the Qilian orogeny are unrelated to the low‐Vs materials of the Tibetan Plateau. In the mid‐lower crust of the Songpan‐Ganzi terrane, its northeastern corner exhibits continuous low‐Vs anomalies, limited to areas south of the West Qinglin and west of 104° E. This suggests that a small‐scale northward viscous flow of crustal materials exists in the eastern KLF. However, two significant crustal flow channels (<jats:italic>V</jats:italic>s ≤ 3.3 km/s) are observed in eastern Tibet. The east–west tectonic movements and the obstruction of the Sichuan Basin together facilitate the dispersion of crustal materials southward from eastern Tibet.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529695","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}
引用次数: 0
U–Pb calcite dating reveals the origin of a 600 km‐long intraplate fault: The Balcones Fault System of Texas U-Pb方解石年代测定揭示了一条长达 600 公里的板内断层的起源：得克萨斯州巴尔克内斯断层系统
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-06-20 DOI: 10.1111/ter.12734
Jean‐Claude Hippolyte, Paul Mann, Pierre Henry, Abel Guihou, Pierre Deschamps, Camille Ourliac, Nicolas Godeau, Lionnel Marié, Mark B. Gordon
{"title":"U–Pb calcite dating reveals the origin of a 600 km‐long intraplate fault: The Balcones Fault System of Texas","authors":"Jean‐Claude Hippolyte, Paul Mann, Pierre Henry, Abel Guihou, Pierre Deschamps, Camille Ourliac, Nicolas Godeau, Lionnel Marié, Mark B. Gordon","doi":"10.1111/ter.12734","DOIUrl":"https://doi.org/10.1111/ter.12734","url":null,"abstract":"Timing is a key data for understanding the origin of faulting. The Balcones fault system (BFS) extends ~600 km along the northern margin of the Gulf of Mexico oil basin and controls springs that supply the major cities in Texas, but its origin is unclear. We provide its first direct timing by applying U–Pb geochronology on seven calcite‐mineralized fault surfaces. We have found that this extensional fault system formed during the Palaeocene‐middle Eocene time (from 61.3 ± 2.7 to 45.4 ± 2.1 Ma), which is much earlier than previous estimates. We show that the formation of the BFS coincides with the largest clastic influx in the northern Gulf of Mexico basin that resulted from Laramide uplift and erosion. This timing and the location of the BFS along the Ouachita suture, support our interpretation of this fault system formed as the result of lithospheric flexure related to Paleogene sedimentary loading.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508453","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}
引用次数: 0
Metallogenic age of the world‐class giant huoshaoyun non‐sulphide Zn–Pb deposit in Karakoram Area, Xinjiang, Northwest China 中国西北新疆喀喇昆仑地区世界级巨型火烧云非硫化物锌铅矿床的成矿时代
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-06-07 DOI: 10.1111/ter.12721
Da Wang, Wenbin Jia, Yongsheng Li, Ryan Mathur, Xiaofei Yu, Yvhan Lu, Meng Dai, Guang-Sheng Yan
{"title":"Metallogenic age of the world‐class giant huoshaoyun non‐sulphide Zn–Pb deposit in Karakoram Area, Xinjiang, Northwest China","authors":"Da Wang, Wenbin Jia, Yongsheng Li, Ryan Mathur, Xiaofei Yu, Yvhan Lu, Meng Dai, Guang-Sheng Yan","doi":"10.1111/ter.12721","DOIUrl":"https://doi.org/10.1111/ter.12721","url":null,"abstract":"Metallogenic geochronology plays a crucial role in the study of ore genesis and mineralization evolution. Unfortunately, accurately determining the metallogenic age of the non‐sulphide Zn–Pb deposits is difficult. Herein, we employed Rb–Sr dating of smithsonite and Sm–Nd dating of coexisting calcite to explore the mineralization ages of the Huoshaoyun Zn–Pb deposit. The Rb–Sr and Sm–Nd isotopic ratios yield isochron ages of 26.6 ± 1.7 and 27.5 ± 7.6 Ma, respectively. These obtained ages are identified as the metallogenic age of the Huoshaoyun deposit. Moreover, investigations into carbonate‐hosted Zn–Pb deposits in the East Tethys Metallogenic belt suggest they have formed in similar tectonic settings and yielded consistent Cenozoic ages. In sum, our research indicates that carbonate‐hosted Pb–Zn metallogenic ages in the East Tethys Metallogenic belt are principally concentrated in the late Palaeogene, and directly related to the collisional orogeny of the Tibetan Plateau during 40–26 Ma.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141371535","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}
引用次数: 0
In‐situ U‐Pb dating of calcite slickenfibre constraints on Cenozoic multiple‐phase faulting along the eastern segment of Chengkou Fault, Dabashan Fold‐and‐Thrust Belt 大巴山褶皱推覆带埕口断层东段新生代多相断层的方解石纤维原位U-Pb测年约束
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-05-29 DOI: 10.1111/ter.12732
Kui Tong, Jinxi Li, Zhiwu Li, I. Tonguç Uysal, Jianxin Zhao, Yuexing Feng, Tian Hua, Shugen Liu
{"title":"In‐situ U‐Pb dating of calcite slickenfibre constraints on Cenozoic multiple‐phase faulting along the eastern segment of Chengkou Fault, Dabashan Fold‐and‐Thrust Belt","authors":"Kui Tong, Jinxi Li, Zhiwu Li, I. Tonguç Uysal, Jianxin Zhao, Yuexing Feng, Tian Hua, Shugen Liu","doi":"10.1111/ter.12732","DOIUrl":"https://doi.org/10.1111/ter.12732","url":null,"abstract":"The Dabashan Fold‐and‐Thrust Belt is an important natural laboratory for exploring the Meso‐Cenozoic intracontinental orogenic evolution in China. Due to the severe lack of post‐Early Cretaceous strata, little attention has been paid to Cenozoic tectonic in the Dabashan. This study presents structural analysis, in‐situ U‐Pb dating of calcite in conjunction with petrographic and stable isotopic analyses along the eastern segment of the Chengkou Fault in the Dabashan. Structural analysis coupled with U‐Pb dating of syn‐kinematic calcite slickenfibres suggests two discrete S‐N compressional strike‐slip deformation events associated with localized E‐W extension along the eastern segment of the Chengkou Fault have occurred at the Early Eocene (~57–50 Ma) and Late Oligocene‐Early Miocene (~23–17 Ma), respectively. We tentatively related the Cenozoic deformation events in the study area to the clockwise rotation of the Sichuan Basin, resulting from the combined far‐field stress effects between the India, Eurasia and western Pacific plates.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141192196","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}
引用次数: 0
Dinoflagellate cysts from the Shillong Plateau, Meghalaya (India): Palynological signature during the late Palaeocene–early Eocene Transition 来自印度梅加拉亚夏隆高原的甲藻囊胞：古新世晚期-始新世早期过渡时期的古生物学特征
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-05-25 DOI: 10.1111/ter.12725
Y. Raghumani Singh, A. Bijayalaxmi Devi, Nithoujam Surdas Singh, Mark B. Abbott, T. Elliot Arnold, W. Ajoykumar Singh, M. Sapana Devi, Sh. Priyokumar Singh, O. Victory Devi
{"title":"Dinoflagellate cysts from the Shillong Plateau, Meghalaya (India): Palynological signature during the late Palaeocene–early Eocene Transition","authors":"Y. Raghumani Singh, A. Bijayalaxmi Devi, Nithoujam Surdas Singh, Mark B. Abbott, T. Elliot Arnold, W. Ajoykumar Singh, M. Sapana Devi, Sh. Priyokumar Singh, O. Victory Devi","doi":"10.1111/ter.12725","DOIUrl":"https://doi.org/10.1111/ter.12725","url":null,"abstract":"The paper presents a new section of the late Palaeocene‐early Eocene, palynological assemblages and stable carbon isotopes from the Lakadong sandstone member of the East Khasi Hills of Meghalaya (India). The Palaeocene‐Eocene transition (PET) is marked by stratigraphic markers of dinoflagellate cysts (taxa of <jats:italic>Apectodinium augustum</jats:italic>, now <jats:italic>Axiodinium augustum</jats:italic>) and negative carbon isotope excursion. The palynofloral assemblage indicates the sequence represents warm, humid tropical to subtropical conditions with heavy rainfall. The depositional environment of the Lakadong Sandstone Member is interpreted to be neritic. The new insights of this study in this section suggest the PET with the occurrence of <jats:italic>Apectodinium</jats:italic> acme consisting of <jats:italic>A. augustum</jats:italic> at CS5‐15a.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141150097","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}
引用次数: 0
Did mid‐Ediacaran regional sea‐level drawdown trigger extensive allochthonous salt breakout and the incision of kilometre‐deep palaeocanyons, Flinders Ranges, South Australia? 埃迪卡拉纪中期的区域海平面下降是否引发了南澳大利亚弗林德斯山脉大面积的异源盐破裂和数公里深的古峡谷内切？
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-05-21 DOI: 10.1111/ter.12724
Sarah M. Giles, Katherine A. Giles, M. G. Rowan, Kiri Maza, Nicholas Christie-Blick, David F. Lankford-Bravo
{"title":"Did mid‐Ediacaran regional sea‐level drawdown trigger extensive allochthonous salt breakout and the incision of kilometre‐deep palaeocanyons, Flinders Ranges, South Australia?","authors":"Sarah M. Giles, Katherine A. Giles, M. G. Rowan, Kiri Maza, Nicholas Christie-Blick, David F. Lankford-Bravo","doi":"10.1111/ter.12724","DOIUrl":"https://doi.org/10.1111/ter.12724","url":null,"abstract":"The Ediacaran Period is of interest for the emergence of multicellular life, one or more glaciations, and the occurrence of the largest δ13C excursion in Earth history (the Shuram). The Ediacaran stratigraphic succession in the Flinders Ranges of South Australia is distinctive also for well‐exposed outcrop examples of palaeocanyons and salt diapirs. We present data placing a level of salt‐sheet breakout during deposition of the Wonoka Formation, within the time span of the Shuram, and at a datum indistinguishable from the canyon incision level. We hypothesize that canyon incision and salt breakout were triggered by subaerial erosion and non‐deposition associated with sea‐level drawdown in a temporarily isolated embayment. This mechanism provides support for the idea that the palaeocanyons were fluvially incised, and imposes a new constraint on the palaeoenvironmental setting of Australia at the time of the Shuram and the Ediacara fauna.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117943","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}
引用次数: 0
Late Jurassic magmatism in the Ligurian‐Piedmont Ocean constrained by zircon ages of mafic and felsic meta‐intrusives 锆石年龄对利古里亚-皮埃蒙特洋晚侏罗世岩浆活动的制约
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-05-18 DOI: 10.1111/ter.12723
Marcello de Togni, Gianni Balestro, Daniela Rubatto, Daniele Castelli, Marco Gattiglio, Andrea Festa
{"title":"Late Jurassic magmatism in the Ligurian‐Piedmont Ocean constrained by zircon ages of mafic and felsic meta‐intrusives","authors":"Marcello de Togni, Gianni Balestro, Daniela Rubatto, Daniele Castelli, Marco Gattiglio, Andrea Festa","doi":"10.1111/ter.12723","DOIUrl":"https://doi.org/10.1111/ter.12723","url":null,"abstract":"Paleogeographic reconstructions show that the Ligurian‐Piedmont Ocean (LPO) was a relatively narrow oceanic basin but the actual amount of oceanic lithosphere generated and the timing of magmatic accretion are still subjects of debate. New U–Pb dating of zircon from two pairs of FeTi‐oxide metagabbro and metaplagiogranite s.l. of the Susa and Lanzo Valleys Ophiolites (Western Alps) yields Late Jurassic magmatic ages (~150 Ma), 10–15 Ma younger than most of the magmatism in the LPO. The potential significance of the geochronological data presented are discussed in relation to the structural architecture of the LPO, emphasizing that the investigated ophiolites represent the youngest oceanic lithosphere accreted in the Western Alps.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141058972","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}
引用次数: 0
Limitations of provenance diagnoses and maximum‐depositional‐age constraints based on detrital‐zircon geochronology: the fertility bias 基于碎屑锆石地质年代学的出处诊断和最大沉积年龄约束的局限性：生育率偏差
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-05-18 DOI: 10.1111/ter.12720
Xiaochun Wei, Hanlin Chen, Eduardo Garzanti, A. Alexander G. Webb, N. Ryan McKenzie, Ping Wang
{"title":"Limitations of provenance diagnoses and maximum‐depositional‐age constraints based on detrital‐zircon geochronology: the fertility bias","authors":"Xiaochun Wei, Hanlin Chen, Eduardo Garzanti, A. Alexander G. Webb, N. Ryan McKenzie, Ping Wang","doi":"10.1111/ter.12720","DOIUrl":"https://doi.org/10.1111/ter.12720","url":null,"abstract":"Detrital zircon U–Pb geochronology (DZG) is widely used in the provenance analysis and calculating maximum depositional ages (MDAs) of strata. To assess the geologic limitations of this approach, we conducted DZG coupled with bulk‐petrology and heavy‐mineral analyses of Miocene volcaniclastic and non‐volcanic siliciclastic sandstones from the SW Tarim Basin. Although these two sandstone types display greatly different bulk‐petrography and heavy‐mineral signatures, they exhibit similar detrital‐zircon‐age spectra, and thus represent a less common case in which interpretations based on DZG alone may misalign with bulk‐sediment provenance. Most zircon‐based MDAs of volcaniclastic sandstones range from 12.3 to 14.8 Ma, deviating from their ca. 11 Ma true depositional age constrained previously. The similarity of zircon‐age spectra in volcaniclastic and siliciclastic sandstones and the 1–4 M.y. the error of the zircon‐based MDAs is ascribed to the low zircon fertility of coeval alkaline magmatic sources. This study emphasizes the importance of an integrated approach to provenance analysis and chronostratigraphy.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141058985","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}
引用次数: 0
Freshwater plume‐like condition near the north‐eastern coastal Arabian Sea during early Miocene: Evidence from the stable isotope record in the growth bands of gastropods (Turritella sp.) 中新世早期阿拉伯海东北海岸附近的淡水羽状状态：腹足类（Turritella sp.）生长带的稳定同位素记录证据
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-05-08 DOI: 10.1111/ter.12719
Yogaraj Banerjee, Prosenjit Ghosh
{"title":"Freshwater plume‐like condition near the north‐eastern coastal Arabian Sea during early Miocene: Evidence from the stable isotope record in the growth bands of gastropods (Turritella sp.)","authors":"Yogaraj Banerjee, Prosenjit Ghosh","doi":"10.1111/ter.12719","DOIUrl":"https://doi.org/10.1111/ter.12719","url":null,"abstract":"The Early Miocene witnessed major tectonic, palaeoceanographic and climatological reorganizations over the Asian realm. The Himalayan and Tibetan plateau upliftment influenced monsoon intensity during this age. Contemporary high‐resolution tropical hydroclimate records are limited. Here, we present an early Miocene sub‐annual stable isotope record from the growth bands of well‐preserved <jats:italic>Turritella</jats:italic> sp. from the Kachchh basin, Western India. It showed δ<jats:sup>13</jats:sup>C and δ<jats:sup>18</jats:sup>O variabilities from −4.83‰ to −1.80‰ and − 7.06‰ to −2.66‰ (in VPDB) respectively. Conventional oxygen isotope thermometry showed an apparent temperature seasonality from 9.3° to 28.1°C. A comparison of the present early Miocene δ<jats:sup>18</jats:sup>O record with the modern δ<jats:sup>18</jats:sup>O records in the carbonates from coastal‐estuarine environments of the Indian Ocean confirmed a high freshwater influx into the NE Arabian Sea during the early Miocene, similar to the modern‐day freshwater plume events observed in the coastal region.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140928563","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}
引用次数: 0
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