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Lead Isotopes Constrain Precambrian Crustal Architecture, Thermal History and Lithospheric Foundering in Laurentia 铅同位素对劳伦西亚前寒武纪地壳结构、热历史和岩石圈形成的影响
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-09-10 DOI: 10.1111/ter.12748
Ian W. Hillenbrand
{"title":"Lead Isotopes Constrain Precambrian Crustal Architecture, Thermal History and Lithospheric Foundering in Laurentia","authors":"Ian W. Hillenbrand","doi":"10.1111/ter.12748","DOIUrl":"https://doi.org/10.1111/ter.12748","url":null,"abstract":"Laurentia (ancestral North America) records nearly 4 billion years of crustal evolution. Here, a newly compiled continental‐scale Pb isotopic database is used to evaluate the Precambrian crustal evolution of Laurentia. Pb model ages yield a 2.7 Ga peak, a 2.5–1.8 Ga minimum and 1.8–0.9 Ga continuum. Pb model ages yield thermochronometric data and track crustal growth via arc‐related magmatism and accretionary orogenesis. Model <jats:sup>232</jats:sup>Th/<jats:sup>204</jats:sup>Pb and <jats:sup>238</jats:sup>U/<jats:sup>204</jats:sup>Pb broadly correlate with mapped crustal domains. More homogeneous and less radiogenic <jats:sup>238</jats:sup>U/<jats:sup>204</jats:sup>Pb and <jats:sup>232</jats:sup>Th/<jats:sup>238</jats:sup>U after 2.7 Ga suggests a shift to more juvenile sources, loss of early isotopic reservoirs and greater crustal reworking. U and Th are fractionated from Pb in Proterozoic orogens with abundant ferroan and anorthosite–mangerite–charnockite–granite(AMCG)‐suite magmatism. This fractionation suggests the removal of Pb‐rich lower crust, supporting petrogenetic models involving lithospheric foundering and magmatic underplating. Lithospheric thinning and associated magmatism may have contributed to high middle Proterozoic geothermal gradients.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223860","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
Apparent Joint Swarms Formed by the Crack‐Jump Process 裂缝-跳跃过程形成的明显联合蜂群
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-08-28 DOI: 10.1111/ter.12747
D. C. P. Peacock, B. Leiss, M. W. Anderson
{"title":"Apparent Joint Swarms Formed by the Crack‐Jump Process","authors":"D. C. P. Peacock, B. Leiss, M. W. Anderson","doi":"10.1111/ter.12747","DOIUrl":"https://doi.org/10.1111/ter.12747","url":null,"abstract":"Joint swarms can be important components of fractured reservoirs. They are often explained as damage around faults or related to mechanical differences between layers, although this does not explain the close spacing of the joints. Joint swarms around Bergen (Norway) are described, which are not related to exposed faults and are not influenced by layering or foliation in the Lower Palaeozoic gneisses. We suggest an evolution whereby: (1) a zone of microcracks develops; (2) one microcrack propagates and becomes connected to a source of mineralising fluid; (3) the fracture becomes a microvein, with a higher tensile strength than the microcracked host rock; (4) another microcrack propagates and the cycle is repeated, producing a zone of microveins; (5) the veins are partly weathered out, producing an apparent joint swarm, or the microveins crack at or near the ground‐surface. Joint swarms in exposed analogues may therefore not occur at reservoir depths.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183398","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
CO2‐Rich Xenoliths at Mt. Vulture Volcano (Southern Italy): New Constraints on the Volcano Plumbing System 秃鹫火山（意大利南部）富含二氧化碳的异岩石：火山管道系统的新制约因素
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-08-27 DOI: 10.1111/ter.12745
Gabriele Carnevale, Antonio Caracausi, Massimo Coltorti, Barbara Faccini, Giulia Marras, Michele Paternoster, Silvio G. Rotolo, Vincenzo Stagno, Vittorio Zanon, Filippo Zummo
{"title":"CO2‐Rich Xenoliths at Mt. Vulture Volcano (Southern Italy): New Constraints on the Volcano Plumbing System","authors":"Gabriele Carnevale, Antonio Caracausi, Massimo Coltorti, Barbara Faccini, Giulia Marras, Michele Paternoster, Silvio G. Rotolo, Vincenzo Stagno, Vittorio Zanon, Filippo Zummo","doi":"10.1111/ter.12745","DOIUrl":"https://doi.org/10.1111/ter.12745","url":null,"abstract":"This study provides new mineral chemistry data together with micro‐thermometric measurements on fluid inclusions hosted in ultramafic xenoliths (lherzolite, wehrlite, and dunite) brought to the surface by the last Mt. Vulture volcano activity (140 ka; southern Italy), and fed by melilitite‐carbonatite magmas. Petrographic evidence and mineralogical compositions of Mt. Vulture xenoliths are consistent with an origin in the upper mantle. Fluid inclusions in rock‐forming minerals of lherzolite and wehrlite xenoliths are CO<jats:sub>2</jats:sub>‐dominated. The equilibrium temperature calculated by geothermometric estimates ranges from 1039 C (±36°C) to 1142°C (±15°C), and entrapment pressures of fluid inclusions with post‐trapping re‐equilibration correspond to the local crust–mantle boundary (32 km depth), and to a shallow reservoir located at 12–14 km depth. These results contribute to constrain the origin of these xenoliths and the depth of storage of magmas erupted from Mt. Vulture, where carbonatite‐like metasomatism and mantle‐derived CO<jats:sub>2</jats:sub> degassing occur.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183399","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
Elevated Tropical Sea Surface Temperatures During the Globally Warm Miocene Caused Heat Stress for Caribbean Coral Reefs 全球变暖的中新世期间热带海洋表面温度升高造成加勒比海珊瑚礁热应力
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-08-21 DOI: 10.1111/ter.12744
Thomas C. Brachert, Lorenz Schwark
{"title":"Elevated Tropical Sea Surface Temperatures During the Globally Warm Miocene Caused Heat Stress for Caribbean Coral Reefs","authors":"Thomas C. Brachert, Lorenz Schwark","doi":"10.1111/ter.12744","DOIUrl":"https://doi.org/10.1111/ter.12744","url":null,"abstract":"The warm Miocene (23.0–5.3 Ma) is considered a model case for the global climate of the near future. In view of the current coral reef crisis, studies on Miocene reefs can contribute to predictions regarding the stress resilience of today's reefs against global warming. A Late Miocene (6.2–5.5 Ma) reef coral fauna from Hispaniola Island (Caribbean) characterised by ecologically tolerant taxa was originally interpreted to reflect cool‐eutrophic waters. However, the associated planktonic foraminifer assemblage and new TEX<jats:sub>86</jats:sub><jats:sup>H</jats:sup>–based temperature reconstructions document an oligotrophic shallow‐water environment harbouring 30–31°C. Thus, in conjunction with unusually low vertical growth rates and erratic trace element signatures of massive reef corals, the coral fauna documents critically high temperatures and a response to heat stress rather than cool upwelling. The findings demonstrate the relevance of understanding shallow‐water ecosystems from past warm periods for developing scenarios of a future, warmer world.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223859","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
The leaky chronometer: Evidence for systematic cryptic Pb loss in laser ablation U‐Pb dating of zircon relative to CA‐TIMS 泄漏的天文钟：与 CA-TIMS 相比，激光烧蚀锆石 U-Pb 测定中系统性隐性铅损失的证据
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-08-06 DOI: 10.1111/ter.12742
Benjamin L. Howard, Glenn R. Sharman, James L. Crowley, Ellen Reat Wersan
{"title":"The leaky chronometer: Evidence for systematic cryptic Pb loss in laser ablation U‐Pb dating of zircon relative to CA‐TIMS","authors":"Benjamin L. Howard, Glenn R. Sharman, James L. Crowley, Ellen Reat Wersan","doi":"10.1111/ter.12742","DOIUrl":"https://doi.org/10.1111/ter.12742","url":null,"abstract":"U–Pb dating of zircon via laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) has become a primary method for determining the age of crystalline rocks and the provenance and maximum depositional age of (meta)sedimentary rocks. Although chemical abrasion has become a standard approach for mitigating Pb loss in zircon dated via high‐resolution thermal ionization mass spectrometry (CA‐TIMS), laser ablation dating is rarely accompanied by chemical abrasion. We evaluate the accuracy of U–Pb dates acquired via LA‐ICP‐MS relative to CA‐TIMS through analysis of a large database of paired analyses from the same zircon crystals. We show that laser ablation <jats:sup>206</jats:sup>Pb/<jats:sup>238</jats:sup>U dates are systematically younger than their CA‐TIMS counterparts, with a greater shift in detrital zircon (−2.0%) versus igneous or metamorphic zircon (−0.9%). Although systematic biases related to “matrix effects” may be a contributing factor, our analysis suggests that unmitigated cryptic Pb loss is likely widespread in laser ablation U–Pb datasets.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931497","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
Deep borehole discoveries beneath the Appalachian Basin: Broad Rodinian rift and Neoproterozoic tectonothermal event 阿巴拉契亚盆地地下的深钻孔发现：宽罗迪尼断裂和新近纪构造热事件
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-07-30 DOI: 10.1111/ter.12741
David W. Valentino, Jeffrey R. Chiarenzelli, Teresa E. Jordan, Robert D. Jacobi, Alexander E. Gates
{"title":"Deep borehole discoveries beneath the Appalachian Basin: Broad Rodinian rift and Neoproterozoic tectonothermal event","authors":"David W. Valentino, Jeffrey R. Chiarenzelli, Teresa E. Jordan, Robert D. Jacobi, Alexander E. Gates","doi":"10.1111/ter.12741","DOIUrl":"https://doi.org/10.1111/ter.12741","url":null,"abstract":"Besides a few isolated rift basins along the Neoproterozoic eastern Laurentian margin, the Appalachian Palaeozoic strata rest unconformably on Mesoproterozoic crystalline basement, reflecting a ca. 550+ Ma hiatus. However, a nearly 3 km deep experimental geothermal borehole through the Appalachian basin at Cornell University, New York, unexpectedly encountered deformed Neoproterozoic greenschist facies phyllites and metavolcanics (Cayuta Formation) beneath the Cambrian non‐conformity. Magnetic modelling shows they are in the 5000 km<jats:sup>2</jats:sup> fault‐bounded Ithaca basin, proposed to be associated with Iapetan rifting. The volcanism and metamorphism appear linked to ca. 600–650 Ma thermal events related or unrelated to extension, but requiring uplift and denudation of 5–10 km of rock prior to deposition of the Cambrian Potsdam Group. The Ithaca basin is &gt;350 km inboard of the Laurentian Iapetus margin, indicating a broad Neoproterozoic rift zone for at least the NY and PA portion of eastern Laurentia.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141864852","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
Damage evolution in layered rock masses of a mining floor under the influence of fluid–structure coupling 流固耦合作用下矿井底板层状岩体的损伤演变
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-07-24 DOI: 10.1111/ter.12737
Shiliang Liu, Ao Wang, Weiguo Li, Yusheng Zheng, Shanlin Wang
{"title":"Damage evolution in layered rock masses of a mining floor under the influence of fluid–structure coupling","authors":"Shiliang Liu, Ao Wang, Weiguo Li, Yusheng Zheng, Shanlin Wang","doi":"10.1111/ter.12737","DOIUrl":"https://doi.org/10.1111/ter.12737","url":null,"abstract":"Current research on rock damage in mining floors primarily focuses on the seepage‐stress coupling effect, overlooking the fact that rock masses in coal measure strata are predominantly layered. To address this gap, cyclic loading and unloading triaxial tests were conducted. Additionally, theoretical analysis, mathematical statistics, and other methods were used to investigate the damage evolution law of layered rock masses in coal measures. This investigation was carried out under the coupled effects of a specific stress path, characterized by ‘stress concentration‐stress unloading‐stress recovery’, and a high confined water seepage field. The results show that the compression modulus increases with the increase in confining pressure and osmotic pressure, but its increasing trend gradually slows down. Within a certain range, increasing the confining pressure and osmotic pressure helps to close rock fractures and increase stiffness.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778549","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
Physical modelling of earthquake precursor by the electro‐optical parameters of gabbro rock under compressive stress 利用压应力作用下辉长岩的电光参数建立地震前兆的物理模型
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-07-20 DOI: 10.1111/ter.12740
Mohammad Mir, Babak Haghighi, Rohollah Taghavi Mendi, Iman Motie
{"title":"Physical modelling of earthquake precursor by the electro‐optical parameters of gabbro rock under compressive stress","authors":"Mohammad Mir, Babak Haghighi, Rohollah Taghavi Mendi, Iman Motie","doi":"10.1111/ter.12740","DOIUrl":"https://doi.org/10.1111/ter.12740","url":null,"abstract":"Earthquakes occur when tectonic stresses develop deep within the Earth. In the earthquake zone, the rocks are igneous, including gabbro. Gabbro rocks produce electron–hole pairs under tectonic stresses. These holes flow in the volume of gabbro rock under tectonic pressures and cause changes in electric charge and as a result, produce variable electric and magnetic fields that lead to a signal of electromagnetic waves at the place of pressure. This electromagnetic signal is received on the surface of the Earth after passing through different layers of the Earth. In this work, by applying uniaxial hydraulic pressure on the gabbro rock, a new physical model similar to an earthquake is presented, which by receiving and monitoring electromagnetic signals, can help to investigate the tectonic changes in the Earth. By utilizing the electrical and optical parameters, the intensity of the electromagnetic signal of the earthquake created on the Earth's surface is calculated.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739810","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
Gravity field and geothermal structure of the Corsica‐Sardinia Block 科西嘉-撒丁岛区块的重力场和地热结构
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2024-07-12 DOI: 10.1111/ter.12738
F. Cocco, L. Casini, A. Funedda
{"title":"Gravity field and geothermal structure of the Corsica‐Sardinia Block","authors":"F. Cocco, L. Casini, A. Funedda","doi":"10.1111/ter.12738","DOIUrl":"https://doi.org/10.1111/ter.12738","url":null,"abstract":"This paper presents a finite‐differences 3D numerical model that simulates the gravity and thermal structure of the Corsica‐Sardinia Block (CSB), an apparently stable lithospheric domain characterized by cryptic tectonic activity. In the experiments, we change the density and heat production rate of the model crust within a range of geologically realistic values to fit the measured Bouguer gravity anomaly and surface heat flow pattern. The discrepancy between the observed geophysical structure and the outcomes of numerical modelling are discussed in relation to the composition of the CSB crust and finally recast in the geodynamic framework of the western Mediterranean region.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614010","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
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
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