Special Publications最新文献_第5页

Relicts of Paleoproterozoic LIPs in the Belomorian Province, eastern Fennoscandian Shield: barcode reconstruction for a deeply eroded collisional orogen 芬诺斯坎地盾东部Belomorian省古元古代唇部遗迹:深侵蚀碰撞造山带的条形码重建

Special Publications Pub Date : 2021-07-02 DOI: 10.1144/SP518-2021-30

A. Stepanova, V. S. Stepanov, A. Larionov, E. Salnikova, A. Samsonov, P. Azimov, S. Egorova, I. I. Babarina, Y. Larionova, M. A. Sukhanova, A. Kervinen, O. Maksimov

引用次数: 8

The geochemical evolution of the Logan Igneous Suite, Ontario, Canada: new insights from the Logan Basin and implications for the genesis of the Mesoproterozoic Midcontinent Rift System 加拿大安大略省洛根火成岩套的地球化学演化:来自洛根盆地的新认识及其对中元古代中大陆裂谷系成因的启示

Special Publications Pub Date : 2021-07-02 DOI: 10.1144/SP518-2021-6

R. Cundari, P. Hollings, M. Smyk, Christian Carl

{"title":"The geochemical evolution of the Logan Igneous Suite, Ontario, Canada: new insights from the Logan Basin and implications for the genesis of the Mesoproterozoic Midcontinent Rift System","authors":"R. Cundari, P. Hollings, M. Smyk, Christian Carl","doi":"10.1144/SP518-2021-6","DOIUrl":"https://doi.org/10.1144/SP518-2021-6","url":null,"abstract":"Abstract The 1.1 Ga Midcontinent Rift System (MRS) of North America comprises a series of Mesoproterozoic flood basalts and intrusive rocks emplaced in the Lake Superior region. The mafic rocks preserved on the NW flank of Lake Superior offer insights into the early development of the rift. New geochemical data collected from intrusive rocks in the Logan Basin, coupled with improved constraints on timing relationships between units, allow for a better understanding of the geochemical evolution of intrusive rocks therein. The extensive dataset suggests many previously unrecognized relationships between MRS intrusive rocks, indicating multiple, distinct mantle-source characteristics with highly variable crustal contamination histories, implying a complicated magma plumbing system. The data presented here suggest that five geochemically distinct mantle source regions were involved in the emplacement of the Logan Igneous Suite, each with its own distinct contamination history and perhaps different degrees of partial melting. The geochemical variations could suggest either a progressive, relative depletion in the mantle source over time or heterogeneity of the source region. However, based on the model for MRS magmatism presented here, we suggest that units related to the Logan Igneous Suite were tapping a heterogeneous mantle source that varied over time.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77018024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The response of calcareous nannoplankton to the latest Pliensbachian–early Toarcian environmental changes in the Camino Section (Basque Cantabrian Basin, northern Spain) 西班牙北部巴斯克坎塔布里安盆地Camino剖面钙质纳米浮游生物对pliensbachia - Toarcian早期环境变化的响应

Special Publications Pub Date : 2021-06-29 DOI: 10.1144/SP514-2020-256

Ángela Fraguas, J. J. Gómez, A. Goy, M. J. Comas-Rengifo

{"title":"The response of calcareous nannoplankton to the latest Pliensbachian–early Toarcian environmental changes in the Camino Section (Basque Cantabrian Basin, northern Spain)","authors":"Ángela Fraguas, J. J. Gómez, A. Goy, M. J. Comas-Rengifo","doi":"10.1144/SP514-2020-256","DOIUrl":"https://doi.org/10.1144/SP514-2020-256","url":null,"abstract":"Abstract Quantitative analysis performed on latest Pliensbachian–early Toarcian calcareous nannofossil assemblages from the Camino section (Basque Cantabrian Basin) allowed their response to the environmental changes recorded during this time interval to be deciphered, characterized by an extinction event. The results were introduced within a principal component analysis and compared with the stable isotope and total organic carbon curves. During the latest Pliensbachian, the Mirabile and the lowermost part of the Semicelatum Ammonite Subzones, Schizosphaerella, Bussonius prinsii, Biscutum finchii, Calcivascularis jansae and Similiscutum avitum, taxa that probably thrived in rather cold waters, dominated the calcareous nannofossil assemblages. Coinciding with warmer and wetter conditions, which probably led to an increase in surface water fertility, recorded slightly below the extinction boundary, the mesotrophic taxa B. novum, L. hauffii and Calyculus spp. were dominant. Nevertheless, T. patulus and C. jansae, which became extinct just below the extinction boundary, show preferences for oligotrophic conditions. Salinities similar to those of modern oceans have been inferred around the extinction boundary, considering the coupling between the abundances of Calyculus spp. and the species richness together with the absence of black shales. After the extinction boundary, nannofossil assemblages were dominated by the deep-dwelling C. crassus and the shallow-dwelling Lotharingius species, interpreted as opportunistic taxa. This work confirms that calcareous nannofossils are a really useful tool for palaeoceanographic and palaeoenvironmental reconstructions, especially in terms of climatic changes.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89319931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

About this title - Mineralization and Sustainable Development in the West African Craton: From Field Observations to Modelling 关于本标题-西非克拉通的矿化和可持续发展:从野外观测到建模

Special Publications Pub Date : 2021-06-29 DOI: 10.1144/sp502

T. Aïfa

引用次数: 0

Pacing of late Pliensbachian and early Toarcian carbon cycle perturbations and environmental change in the westernmost Tethys (La Cerradura Section, Subbetic zone of the Betic Cordillera, Spain) 西班牙Betic Cordillera亚北洋带La Cerradura剖面特提斯最西端Pliensbachian晚期和Toarcian早期碳循环扰动与环境变化的步调

Special Publications Pub Date : 2021-06-23 DOI: 10.1144/SP514-2021-27

Ricardo L. Silva, M. Ruhl, Cillian Barry, M. Reolid, W. Ruebsam

{"title":"Pacing of late Pliensbachian and early Toarcian carbon cycle perturbations and environmental change in the westernmost Tethys (La Cerradura Section, Subbetic zone of the Betic Cordillera, Spain)","authors":"Ricardo L. Silva, M. Ruhl, Cillian Barry, M. Reolid, W. Ruebsam","doi":"10.1144/SP514-2021-27","DOIUrl":"https://doi.org/10.1144/SP514-2021-27","url":null,"abstract":"Abstract Detailed assessment of high-resolution elemental and isotopic geochemical datasets collected from the marl–limestone alternations cropping out at La Cerradura (Subbetic domain of the Betic Cordillera, Spain) and chrono- and chemostratigraphic correlation with the reference Mochras borehole (Cardigan Bay Basin, UK) unveiled valuable new insights into understanding of late Pliensbachian–early Toarcian palaeoenvironmental dynamics in a key geographical area between the northern European seaway and the Tethys Ocean. This study shows that deposition in the study area took place under dominantly oxic water column conditions, indicated, for example, by the generalized lack of enrichment in organic matter and redox metals typically associated with anoxia and euxinia. Carbon isotope stratigraphy (δ13CTOC) allowed recognition of the spinatum (=emaciatum in the Submediterranean Province), Pliensbachian–Toarcian, and early Toarcian Oceanic Anoxic Event negative carbon isotopic excursions and the late Pliensbachian positive carbon isotopic excursion. It is here suggested that the observed periodic changes in lithology and sedimentary geochemistry occur at orbital frequencies (i.e. long and short eccentricity and, tentatively, precession), hinting at an astronomical control of the local–regional climate and environment during the Pliensbachian and Toarcian in the mid- to low-latitude South Iberian palaeomargin area.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81631183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

About this title - Subsurface Sand Remobilization and Injection 关于这个题目-地下砂的再活化和注入

Special Publications Pub Date : 2021-06-23 DOI: 10.1144/sp493

S. Silcock, M. Huuse, M. Bowman, A. Hurst, S. Cobain

{"title":"About this title - Subsurface Sand Remobilization and Injection","authors":"S. Silcock, M. Huuse, M. Bowman, A. Hurst, S. Cobain","doi":"10.1144/sp493","DOIUrl":"https://doi.org/10.1144/sp493","url":null,"abstract":"Sand injectites form during shallow-crustal deformation. Short periods of elevated pore-fluid pressure, which developed regionally, triggered formation of hydrofracture networks into which sand was sometimes injected. Sand injection complexes preserve a record of this process and sandstone intrusions are significant reservoirs in many petroleum systems. Most known subsurface sand injection complexes are from offshore NW Europe and associated with Paleogene strata. Outcrop occurrence is global. Sand injection into unconventional host rocks, including granitoid and metamorphic basement and coal seams, raises awareness of the breadth of geological environments in which sand injection may occur. Discordance between sandstone intrusions and sedimentary hosts occurs on a scale from millimetres to kilometres and is a fundamental diagnostic of intrusions. Microscale textural characterization provides new opportunities to establish possible additional criteria for differentiating intrusions from depositional sandstone. The significance of sand injection complexes in shallow crustal evolution is exemplified by the wide range of lithological hosts and diverse tectonostratigraphic settings documented in this volume. Potential for original research still remains.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84863038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Perspectives on the active volcanoes of China 对中国活火山的看法

Special Publications Pub Date : 2021-06-17 DOI: 10.1144/SP510-2021-87

Jiandong Xu, C. Oppenheimer, J. Hammond, H. Wei

{"title":"Perspectives on the active volcanoes of China","authors":"Jiandong Xu, C. Oppenheimer, J. Hammond, H. Wei","doi":"10.1144/SP510-2021-87","DOIUrl":"https://doi.org/10.1144/SP510-2021-87","url":null,"abstract":"Abstract China has a rich record of Holocene volcanism that is relatively little known outside the country. It is encountered in large stratovolcanoes in the NE, linked to subduction of the Pacific plate (e.g. Changbaishan), in smaller volcanoes on the Tibetan margin, associated with the collision of India and Eurasia (e.g. Tengchong, Ashishan), and in more isolated centres, possibly resulting from mantle upwelling (e.g. volcanoes in Hainan island). This makes China a natural laboratory for studies of intraplate volcanism, and significant progress in understanding its nature and origins has been made over the past quarter century. Here, we introduce the first publication in English to provide a comprehensive survey of the state of knowledge and research highlights. Accordingly, we provide an overview of the dynamics, geology, geochemistry, volcanic histories and geophysical studies of 14 volcanic areas associated with the Holocene documented thus far. The special publication represents a benchmark reference on the topic but, as importantly, we hope that it will stimulate new, international collaborations aimed at deepening our understanding of the origins, history, hazards and associated risks of China's volcanoes.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81325934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Diamondiferous kimberlites from recently explored Upper Muna Field (Siberian Craton): petrology, mineralogy and geochemistry insights 最近发现的上穆纳油田(西伯利亚克拉通)的钻石金伯利岩:岩石学、矿物学和地球化学见解

Special Publications Pub Date : 2021-06-08 DOI: 10.1144/SP513-2021-9

D. Yakovlev, S. Kostrovitsky, B. Fosu, I. Ashchepkov

{"title":"Diamondiferous kimberlites from recently explored Upper Muna Field (Siberian Craton): petrology, mineralogy and geochemistry insights","authors":"D. Yakovlev, S. Kostrovitsky, B. Fosu, I. Ashchepkov","doi":"10.1144/SP513-2021-9","DOIUrl":"https://doi.org/10.1144/SP513-2021-9","url":null,"abstract":"Abstract Petrographic, geochemical and mineralogical characteristics of diamond deposits from the Upper Muna field have been investigated. Geochemically, diamondiferous kimberlites from Upper Muna belong to the most widespread Fe–Mg-rich rocks in the Yakutian kimberlite province (average FeOtotal = 8.4 wt%, MgO = 32.36 wt%, TiO2 = 1.6 wt%). Striking mineralogical features of Upper Muna kimberlites are: (1) abundance of monticellite and perovskite in the groundmass; (2) rare occurrence of Mg-ilmenite; (3) abundance of phlogopite megacrysts (up to 8 cm across); and (4) coexistence of low-Cr (0.1–4 wt% Cr2O3, with 0.8–1.2 wt% TiO2) and high-Cr (3–8 wt% Cr2O3, with 0.1–0.6 wt% TiO2) garnet megacrysts with contrasting rare earth element patterns. The compositional features of groundmass minerals, the relatively low CaO and CO2 contents in kimberlites and few deuteric alteration in Upper Muna kimberlites suggest high-temperature melt crystallization during pipe emplacement. Based on the compositional data of garnet and Cr-diopside from megacrysts and peridotites, we suggest a poor Cr dunite–harzburgitic and lherzolitic mantle source beneath the Upper Muna field where Cr-diopside crystallized within a wide pressure and temperature range (40–65 kbar and 900–1350°С). The mineral geochemistry, trace element distribution and Sr–Nd isotope variations of Upper Muna kimberlites are typical for group I kimberlites and reflect a deep-seated asthenospheric (convective mantle) source for the kimberlites.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90881761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

About this title - Geoethics: Status and Future Perspectives 关于这个题目-地球伦理学:现状和未来展望

Special Publications Pub Date : 2021-06-08 DOI: 10.1144/sp508

G. Di Capua, P. Bobrowsky, S. Kieffer, C. Palinkas

引用次数: 1

Platinum-group element geochemistry of the Panjal Traps: constraints on mantle melting and implications for mineral exploration 潘加尔圈闭的铂族元素地球化学:地幔熔融的制约因素及其找矿意义

Special Publications Pub Date : 2021-06-08 DOI: 10.1144/SP518-2020-241

J. G. Shellnutt, K. Pang, L. Qi, G. Bhat

{"title":"Platinum-group element geochemistry of the Panjal Traps: constraints on mantle melting and implications for mineral exploration","authors":"J. G. Shellnutt, K. Pang, L. Qi, G. Bhat","doi":"10.1144/SP518-2020-241","DOIUrl":"https://doi.org/10.1144/SP518-2020-241","url":null,"abstract":"Abstract Forty-two volcanic rocks of the Panjal Traps were analysed for platinum-group elements (PGEs) to investigate the magma genesis, high-temperature behaviour and exploration potential of these elements. The PGE data exhibit substantial variability and show no systematic relation to their low- or high-Ti affinity. Instead, the basalts can be subdivided into a PGE-undepleted group (group 1) that has ΣPGE >10 ppb and Cu/Pd <30 000, and a PGE-depleted group, which consists of a subgroup showing limited (group 2A) or substantial depletion in Ir-series PGEs relative to Ni (group 2B). The group 1 samples indicate an S-undersaturated history, whereas the group 2 samples might have different origins in terms of S-saturation. Fractionation of a tiny amount of sulfide melts (0.075–0.1%) from a representative group 1 sample accounts for the chalcophile element patterns observed in the group 2B samples. The relatively high Cu/Pd, unfractionated Ni/Ir and low PGE abundances observed in the group 2A samples cannot be explained by equilibration of an immiscible sulfide melt alone, and probably require decomposition of residual sulfides into sulfide melt and a monosulfide solid solution in the mantle restite. Our results question the notion that the coexistence of PGE-undepleted and -depleted magmas is prospective in the exploration of magmatic Ni–Cu–(PGE) sulfide mineralization.","PeriodicalId":22055,"journal":{"name":"Special Publications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87875949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1