Canadian Journal of Earth Sciences最新文献_第10页

Taphonomy and depositional history of the Southfork Quarry (Cypress Hills Formation, late Eocene) in southwestern Saskatchewan, Canada 加拿大萨斯喀彻温省西南部南弗克采石场(晚始新世柏树山组)的地学和沉积史

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-10-03 DOI: 10.1139/cjes-2021-0161

Meagan M. Gilbert, Frank H. McDougall

{"title":"Taphonomy and depositional history of the Southfork Quarry (Cypress Hills Formation, late Eocene) in southwestern Saskatchewan, Canada","authors":"Meagan M. Gilbert, Frank H. McDougall","doi":"10.1139/cjes-2021-0161","DOIUrl":"https://doi.org/10.1139/cjes-2021-0161","url":null,"abstract":"The Eocene to Miocene Cypress Hills Formation (CHF) spans 28 million years and forms the conglomeratic caprock of the Cypress Hills and Swift Current plateaus in southwestern Saskatchewan and southeastern Alberta. These stacked fluvial, floodplain, and lacustrine deposits preserve the only high latitude, non-polar mammalian fossil assemblage (Uintan to Hemingfordian land mammal stages) in Canada. The Quarry is the oldest CHF (Chadronian 1, late Eocene) site documented in the Cypress Hills region north of the town of Eastend. The Quarry was originally discovered in 1962, after bones were found to be eroding out of the base of a road cut north of the ghost town of South Fork on the southeastern flanks of the Cypress Hills. Numerous field campaigns have resulted in the collection of fossils from a multitaxonomic bonebed. This paper presents a detailed sedimentologic, paleontologic, and taphonomic study to establish a depositional environment framework of the Southfork Quarry. This site was deposited at the onset of the Eocene–Oligocene climate transition, a critical time of climate change during the Paleogene. Six facies and two facies associations are characterized for the Quarry, shifting from a braided-fluvial system to a debris flow-filled incised channel. Patterns of skeletal accumulations and bone surface modification indicate that the assemblage accumulated over a significant interval of time in different depositional environments. This study provides critical insight into environmental shifts driven by climate change and relates these findings to a broader understanding of the Eocene–Oligocene transition in North America.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"118 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77923524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Introduction to Landscape & Seascape Responses to Canada’s Changing Climate 加拿大气候变化对景观和海景的响应简介

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-27 DOI: 10.1139/cjes-2022-0095

T. James, A. Blais-Stevens, J. Clague, D. Forbes, A. LeBlanc, Sharon L. Smith

引用次数: 0

Structural evolution and U-Pb geochronology of the metasedimentary Nemiscau subprovince, Canada: implications for Archean tectonics in the Superior Province 加拿大Nemiscau省元沉积构造演化与U-Pb年代学:对苏必利尔省太古宙构造的启示

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-27 DOI: 10.1139/cjes-2022-0054

Rocio Pedreira Perez, A. Tremblay, Yannick Daoudène, J. David, D. Bandyayera

引用次数: 1

The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? III: The orogenic foredeep 中白垩世半岛山脉造山运动:科迪勒拉构造的新视角?造山带前深

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-27 DOI: 10.1139/cjes-2022-0089

R. Hildebrand, Bhattacharya J., J. Whalen

{"title":"The mid-Cretaceous Peninsular Ranges orogeny: a new slant on Cordilleran tectonics? III: The orogenic foredeep","authors":"R. Hildebrand, Bhattacharya J., J. Whalen","doi":"10.1139/cjes-2022-0089","DOIUrl":"https://doi.org/10.1139/cjes-2022-0089","url":null,"abstract":"The Cretaceous Western Interior Basin reflects the interplay between the North American craton and allochthonous terranes to the west. We divide the basinal stratigraphy into three successions, Aptian-Albian, Cenomanian-Turonian, and Santonian-Maastrichtian, each related to periods of deformation in the adjacent fold-thrust belt. Here we focus on the Cenomanian-Turonian succession, where progressive west to east uplift and fluvial incision of older Aptian-Albian sedimentary rocks (Cedar Mtn-San Pitch-Thermopolis-Skull Creek-Mannville) are interpreted as a migrating forebulge. Uplift was underway at 103 Ma in the west (Paddy-Blackleaf-Muddy sandstones) and propagated eastward throughout the trough by 99.5 Ma (Viking-Bow Island-Newcastle sandstones). The incised fluvial valleys were subsequently filled by swampy and shallow marine facies, then overlain by dark, marine Neogastroplites-bearing shale and associated bentonites of the 100-97.5 Ma Shell Creek-Mowry-Slater River-Goodrich-Shaftesbury-Westgate shales. The shales are characterized by a distinctive condensed horizon with abundant fish scales, teeth, and bones. They are interpreted as outer-trench slope deposits, with the overlying anoxic horizon representing a starved isochronous unit formed atop the slope deposits. The starved horizon is overlain by prodeltaic muddy clinoforms of easterly migrating clastic wedges (Trevor-Dunvegan-Frontier-Cintura-Mexcala) that can be traced 800 km atop the fish-scale hash and contain hinterland-derived 99-90 Ma detrital zircons. Although the Western Interior Basin has long been considered a retro-arc trough, the overall succession instead suggests that the Cretaceous-Turonian part represents a collisional foredeep created during the ~100 Ma collision between the arc-bearing Peninsular Ranges composite terrane and North America. The accretion brought tyrannosaurids, pachycephalosaurs, snakes and marsupials to North America.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"52 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85417481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

Petrogenesis of siliciclastic sediments and sedimentary rocks explored in three-dimensional Al2O3 – CaO*+Na2O – K2O – FeO+MgO (A-CN-K-FM) compositional space 在Al2O3 - CaO*+Na2O - K2O - FeO+MgO (A-CN-K-FM)三维组成空间中探讨了硅质碎屑沉积物和沉积岩的岩石成因

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-22 DOI: 10.1139/cjes-2022-0051

C. Fedo, M. Babechuk

{"title":"Petrogenesis of siliciclastic sediments and sedimentary rocks explored in three-dimensional Al2O3 – CaO*+Na2O – K2O – FeO+MgO (A-CN-K-FM) compositional space","authors":"C. Fedo, M. Babechuk","doi":"10.1139/cjes-2022-0051","DOIUrl":"https://doi.org/10.1139/cjes-2022-0051","url":null,"abstract":"Quantitatively determining the amount of chemical weathering within sedimentary rocks (and weathering profiles) took a major step forward with the creation of the chemical index of alteration (CIA) forty years ago. The CIA relates the proportion of immobile aluminum to the mobile cations calcium, sodium, and potassium and is grounded in empirical and modeled geochemical data for mineral reactions that occur during hydrolysis. However, the CIA should be applied cautiously because it is a one-dimensional value that in the most complex situations, as with clastic sedimentary rocks, homogenizes the compositional inputs of source, weathering, sorting, and diagenesis. Subsequently developed two-dimensional ternary diagrams (Al2O3–CaO*+Na2O–K2O; Al2O3–CaO*+Na2O+K2O–FeO+MgO) permitted the capacity to explore mineralogical-geochemical pathways in data sets that may separate those inputs, but interpreting the ternary diagrams may be complicated because they differentiate and group certain elements. Here we develop a three-dimensional tetrahedral diagram (Al2O3–CaO*+Na2O–K2O–FeO+MgO, A-CN-K-FM) that incorporates the same critical elements and permits the simultaneous assessment of felsic and mafic rocks and minerals on the same diagram, while retaining the ability to separate plagioclase from alkali feldspar and monitor post-depositional potassium changes. Using the tetrahedral plot, we show that both the CIA value and positions on the 2D ternary diagrams can generate potentially misleading interpretations without properly budgeting the ferromagnesian components in parallel. We first show how the tetrahedron works, then use it with numerous previously published examples to identify how the competing mafic and felsic inputs shape the composition of source rocks, weathering profiles, actively transporting sediment, paleosols, and sedimentary rocks in sedimentary petrogenesis.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"54 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82236105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 24

Rapid coastal erosion of ice-bonded deposits on Pelly Island, southeastern Beaufort Sea, Inuvialuit Settlement Region, western Canadian Arctic 加拿大西部北极地区因纽瓦卢特人定居区，波弗特海东南部Pelly岛冰结合沉积物的快速海岸侵蚀

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-20 DOI: 10.1139/cjes-2021-0118

François Malenfant, D. Whalen, P. Fraser, D. van Proosdij

{"title":"Rapid coastal erosion of ice-bonded deposits on Pelly Island, southeastern Beaufort Sea, Inuvialuit Settlement Region, western Canadian Arctic","authors":"François Malenfant, D. Whalen, P. Fraser, D. van Proosdij","doi":"10.1139/cjes-2021-0118","DOIUrl":"https://doi.org/10.1139/cjes-2021-0118","url":null,"abstract":"This paper quantifies rates of shoreline change and investigates the influence of surficial geology on shoreline dynamics between 1950 and 2018 on Pelly Island, located 10 km off the Mackenzie Delta. Long-term changes in shoreline position were calculated using imagery analysis and Analysing Moving Boundaries Using R (AMBUR). The influence of shoreline exposure to predominant storm direction and influence of surficial geology were examined for Northwest and Southeast zones. The average annual linear regression rate (LRR) rate during the 1950-2018 observation period was -3.8 m∙a-1. The end point rate (EPR) was calculated for six observation periods: 1950-1972, 1972-1985, 1985-2000, 2000-2018, 2013-2018. A mean EPR of -5.5 ± 0.7 m∙a-1 was calculated for the 2000-2018 period, and a maximum retreat rate of 46.7 ± 2.1 m∙a-1 was recorded during the 2013-2018 observation period. By comparing the rate of change for sections of historical shorelines with differing surficial geology and exposure to storms, it was possible to draw conclusions on why Pelly Island continues to have the highest retreat rates in the Mackenzie-Beaufort region. Greater retreat rates were observed in lacustrine deposits (5.3 m∙a-1) compared to moraine deposits (2.7 m∙a-1). In addition, shoreline exposure to the predominant storm direction from the Northwest was found to be a major influence on rates of shoreline change in all observation periods.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"38-40 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78293125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

Late Quaternary changes in sediment sources in the Labrador Sea 拉布拉多海沉积物来源的晚第四纪变化

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-15 DOI: 10.1139/cjes-2022-0026

J. Andrews, D. Piper

{"title":"Late Quaternary changes in sediment sources in the Labrador Sea","authors":"J. Andrews, D. Piper","doi":"10.1139/cjes-2022-0026","DOIUrl":"https://doi.org/10.1139/cjes-2022-0026","url":null,"abstract":"Quaternary sediment in the Labrador Sea was derived from many proglacial sources in Greenland and eastern Canada. Understanding the spatial and temporal changes in sediment provenance provides information on ice extent and sediment dispersal patterns. Variations in mineral composition of sediment from late Quaternary cores has been determined by a whole pattern quantitative X-ray diffraction procedure. Mineral facies were extracted statistically by a supervised analysis of 90 samples from bedrock and ice-rafted clasts, which were then used to predict the most probable mineral facies in 1443 marine sediment samples. We used a non-parametric Classification Decision Tree (CDT) to validate that decision. Only 26% of the samples were misclassified in the CDT. The six facies identified consisted of four facies reflecting differences in the composition of Canadian and Greenland Precambrian igneous and metamorphic bedrock, a set of samples dominated by high wt%s of calcite and dolomite (detrital carbonate (DC) and Hudson Strait Heinrich (HS-H) events), and a “shale” facies. We isolated 284 sediments from the HS-H detrital carbonate facies and determined that they could be divided into four categories based on differences in their mineral proportions. These categories vary geographically, based on non-carbonate sediment supply during these events from Greenland, the Canadian Shield, the Appalachians and the outer continental shelf. In the Holocene of the Labrador Sea, dolomite is derived from Baffin Bay and abundance of calcite is influenced by both biogenic productivity and dissolution.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"17 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88229782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Petrology of the Halifax County complex, North Carolina, Southern Appalachians: constraints from petrography, mineral chemistry, and geothermobarometry 北卡罗莱纳南部阿巴拉契亚哈利法克斯县复合体的岩石学:来自岩石学、矿物化学和地温压学的限制

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-09-12 DOI: 10.1139/cjes-2022-0037

J. Chaumba

{"title":"Petrology of the Halifax County complex, North Carolina, Southern Appalachians: constraints from petrography, mineral chemistry, and geothermobarometry","authors":"J. Chaumba","doi":"10.1139/cjes-2022-0037","DOIUrl":"https://doi.org/10.1139/cjes-2022-0037","url":null,"abstract":"Abstract The Halifax County complex (HCC) is a meta-ultramafic/metamafic body that crops out along the easternmost exposed part of the Carolina superterrane in northeastern North Carolina. Petrographic and mineral chemistry studies were undertaken to place some constraints on the evolution of the HCC. HCC amphiboles are zoned, with hornblende cores and actinolitic rims. Feldspar minerals span the whole plagioclase- and potassium-feldspar spectrum. Evolved olivines (Fo69-75) are primary, and pyroxenes plot in the enstatite, pigeonite, augite and diopside fields. Low TiO2 (<0.8 wt%) clinopyroxenes and highly calcic plagioclases are consistent with origin of the HCC at an island-arc setting. Chlorites are characterized by wide variations in their Si atoms per formula unit but have restricted total Fe concentrations. Potassium feldspar in the HCC likely originated during adularization or potassification. Chlorite thermometry yields temperatures of formation of 241-300 oC. Application of hornblende-plagioclase thermometers yields average temperatures of 648 oC consistent with amphibolite facies conditions as well as greenschist facies conditions, at pressures of up to 6.5 kbars. Clinopyroxene and evolved olivine compositions are both consistent with an island arc origin for the HCC. Amphibolite facies metamorphisms recorded by HCC rocks likely represent metamorphism of the HCC during arc-arc terrane collision, whereas greenschist metamorphism is interpreted to record the temperatures of thrusting of the HCC onto its present location at pressures of <3 kbars in Alleghanian times during the final assembly of the Appalachians. Results reported here have implications for the origin of comparable metamorphosed mafic-ultramafic rocks encountered along ancient orogenic belts worldwide.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"323 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74346642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Deformation history and tectonic significance of the Sanagak Lake shear zone, Boothia Peninsula, Nunavut 努纳武特布西亚半岛沙那嘎湖剪切带的变形史及其构造意义

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-08-31 DOI: 10.1139/cjes-2022-0046

Derek Drayson, A. Camacho, M. Sanborn-Barrie, D. Regis, K. Larson, Alix Osinchuk, S. Dufrane

{"title":"Deformation history and tectonic significance of the Sanagak Lake shear zone, Boothia Peninsula, Nunavut","authors":"Derek Drayson, A. Camacho, M. Sanborn-Barrie, D. Regis, K. Larson, Alix Osinchuk, S. Dufrane","doi":"10.1139/cjes-2022-0046","DOIUrl":"https://doi.org/10.1139/cjes-2022-0046","url":null,"abstract":"The recently recognized Sanagak Lake shear zone (SLsz) is a 165 km long, southwest striking corridor of high-strain rocks that transects the southern portion of Boothia Peninsula, Nunavut. This zone records pervasive deformation (DSL1) at conditions of ~0.52 GPa and ~700°C, and localized deformation (DSL2) at ≥ 0.5 GPa and 300-500°C that preserve left lateral and right lateral senses of movement, respectively. Neocrystallized DSL1 titanite in a hornblende-bearing granodiorite yield an age of 1804 ± 6 Ma, interpreted to be the timing of DSL1. The timing of DSL2 is loosely bracketed by 40Ar/39Ar hornblende (1814 ± 3 Ma) and biotite (1743 ± 1 Ma) cooling ages since the deformation temperature falls between the estimated closure temperature of these minerals. Similar rock types and metamorphic conditions on either side of the shear zone rule out the SLsz as a terrane boundary. Rather, strain localization may have been triggered by thermal softening related to the emplacement of a northeast-trending belt of high-temperature granites south of the shear zone between 1840 and 1820 Ma. Deformation and metamorphism at ca. 1.81 Ga south of Boothia Peninsula and in the central Rae (Committee Bay belt) has been attributed to the Superior Province colliding with the southeastern margin of the Rae craton, such that the SLsz may too have formed in response to far-field stresses derived from this collision. The absence of ca. 1.81 Ga tectonic fabrics north of the shear zone, indicates that the SLsz marks the northwestern extent of mid-crustal, Trans-Hudson related tectonometamorphism.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"22 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89635487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Trans-Avalonian green–black boundary (early Middle Cambrian): transform fault-driven epeirogeny and onset of 26 m.y. of shallow marine anoxia in Avalonia (Rhode Island–Belgium) and Baltica 跨阿瓦洛尼亚绿黑边界(中寒武纪早期):阿瓦洛尼亚(罗德岛-比利时)和波罗的海地区转换断层驱动的造山运动和26年浅海缺氧的开始

IF 1.4 4区地球科学

Canadian Journal of Earth Sciences Pub Date : 2022-08-30 DOI: 10.1139/cjes-2022-0065

E. Landing, S. Westrop, G. Geyer

{"title":"Trans-Avalonian green–black boundary (early Middle Cambrian): transform fault-driven epeirogeny and onset of 26 m.y. of shallow marine anoxia in Avalonia (Rhode Island–Belgium) and Baltica","authors":"E. Landing, S. Westrop, G. Geyer","doi":"10.1139/cjes-2022-0065","DOIUrl":"https://doi.org/10.1139/cjes-2022-0065","url":null,"abstract":"The Avalonia microcontinent has diagnostic terminal Ediacaran–Ordovician lithostratigraphy, depositional sequence architecture, and igneous activity that extends for 2000+ km and reflects epeirogeny related to the Avalonian transform fault. Avalonia records an abrupt early Middle Cambrian (late Wuliuan) change from green, purple, or light grey to overlying black, dark grey, and brown facies in platform and off-platform areas (Meguma, North Wales). This change within one trilobite zone marks onset of ca. 26 m.y. of shallow-marine anoxia/strong dysoxia lasting into the Ordovician with Hatch Hill OMZ onlap onto the shelf. A Bakken model (new, based on the middle Paleozoic Bakken Formation) is applied to shallow-shelf–shoreline organic-rich mud deposition. Erosion of greenish Avalonian depositional sequence (Ads) 7 was followed by Ads 8 tilting, volcanism, debris flows, and bentonite deposition on a cryptic unconformity in SE Newfoundland. The early Middle Cambrian age of the Ads 7–8 boundary is obscured by referring the lower Manuels River Formation and Cristallinium cambriense Zone to the younger Drumian Stage. Ads 8 has thin ashes in coterminous British and American Avalonia where erosion and subaerial exposure with caliche development preceded onlap of upper Middle or Upper Cambrian Ads 9 black muds and sands. The green–black change emphasizes Avalonian unity; it precludes multiple Avalonian “micro-terranes” or assigning parts of Avalonia to West Gondwana or “Ganderia” (the Little River, Brookville, and Bras d’Or “terranes” are part of the Avalonian marginal platform). Coeval green–black transitions and similar later Cambrian faunas show comparable paleoenvironments in Avalonia and Baltica.","PeriodicalId":9567,"journal":{"name":"Canadian Journal of Earth Sciences","volume":"23 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82517661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 3