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Miocene ductile thinning below the Folegandros Detachment System, Cyclades, Greece 希腊基克拉迪斯Folegandros拆离系统下中新世韧性减薄
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2023-02-17 DOI: 10.1111/ter.12646
C. Bakowsky, D. Schneider, B. Grasemann, K. Soukis
{"title":"Miocene ductile thinning below the Folegandros Detachment System, Cyclades, Greece","authors":"C. Bakowsky, D. Schneider, B. Grasemann, K. Soukis","doi":"10.1111/ter.12646","DOIUrl":"https://doi.org/10.1111/ter.12646","url":null,"abstract":"Folegandros island lies between the established SW‐directed West Cycladic and S‐directed Santorini detachment systems. Preserving shear‐sense indicators with opposing kinematics, the geodynamics and timing of kinematics are debated. Using white mica 40Ar/39Ar geochronology complemented by structural data, we report a new Miocene top‐to‐S detachment system, the Folegandros Detachment System (FDS), that is coupled with pure‐shear flattening and juxtaposes the Cycladic Blueschist Unit below Early Cretaceous to early Eocene low‐grade marble and quartzitic‐phyllitic sequences, topped by a metaflysch. Chronostratigraphic correlation and detrital zircon geochronology reveal the low‐grade rocks from the hanging wall of the FDS likely belong to the Pelagonian Zone. Middle Miocene zircon and apatite (U‐Th)/He cooling ages correspond to the latest stages of exhumation. Observations of opposing kinematics on Sikinos, Ios and now Folegandros reveal that ductile thinning played a more significant role in accommodating Miocene exhumation of high‐pressure rocks in the southern Cyclades than previously postulated.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42982922","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: 2
Brittle basement deformation during the Caledonian Orogeny observed by K‐Ar geochronology of illite‐bearing fault gouge in west‐central Sweden 瑞典中西部伊利石断层泥K-Ar地质年代学观测到的加里东造山运动期间的脆性基底变形
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2023-02-15 DOI: 10.1111/ter.12645
B. Almqvist, R. Lelij, K. Högdahl, R. Lescoutre, J. Schönenberger, H. Fossen, H. Sjöström, C. Juhlin, S. Luth, S. Grigull, G. Viola
{"title":"Brittle basement deformation during the Caledonian Orogeny observed by K‐Ar geochronology of illite‐bearing fault gouge in west‐central Sweden","authors":"B. Almqvist, R. Lelij, K. Högdahl, R. Lescoutre, J. Schönenberger, H. Fossen, H. Sjöström, C. Juhlin, S. Luth, S. Grigull, G. Viola","doi":"10.1111/ter.12645","DOIUrl":"https://doi.org/10.1111/ter.12645","url":null,"abstract":"This study presents K‐Ar ages of illite‐bearing fault gouges in crystalline basement in central‐western Sweden. Samples were taken from two faults that localized brittle deformation marginal to and within mafic dikes that intruded Paleoproterozoic granitoids. K‐Ar ages from 10 separated grain fractions span from 823 to 392 Ma. Older ages obtained (823–477 Ma) were influenced by a mixture of illite and K‐feldspar; the latter likely formed during a hydrothermal event prior to faulting. The remaining ages (442.1 ± 9.7 to 391.7 ± 6.1 Ma) were obtained from fractions from both faults hosting only authigenic illite and show that illite crystallized during the Scandian phase of the Caledonian orogeny. These results indicate that previously presumed autochthonous Caledonian basement was involved in continental contraction and subsequent collapse of the Caledonian orogen, influencing both the mode and depth of penetration of deformation into Baltica.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44874300","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
Detrital zircon age signatures of the Mesozoic in the Lusitanian Basin and implications for the evolution of Iberia–Newfoundland conjugate margins 卢西塔尼亚盆地中生代碎屑锆石年龄特征及其对伊比利亚-纽芬兰共轭边缘演化的影响
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2023-01-27 DOI: 10.1111/ter.12644
P. Dinis, P. Vermesch, P. Callapez
{"title":"Detrital zircon age signatures of the Mesozoic in the Lusitanian Basin and implications for the evolution of Iberia–Newfoundland conjugate margins","authors":"P. Dinis, P. Vermesch, P. Callapez","doi":"10.1111/ter.12644","DOIUrl":"https://doi.org/10.1111/ter.12644","url":null,"abstract":"New detrital zircon age results from the Lusitanian Basin are integrated with published data for the Mesozoic of west Iberia and eastern Canada (4959 concordant ages). Zircons in new samples are either mainly Devonian‐Permian, Cryogenian‐Ediacaran or reveal a combination of these two age populations, showing secondary to minor Mesoproterozoic‐Archean ages. Statistical tools applied to the compiled age data allow grouping the samples according to age signatures and explain main features of the age spectra. Age signatures are determined by the abundance of zircon: (1) recycled from terranes involved in Pangea amalgamation; (2) associated with Acadian‐Variscan crystalline rocks (~420–310 Ma), which becomes younger from the Laurentian to the Gondwanan sides of the orogen; (3) associated with post‐collisional events (~300–285 Ma) that affected different terranes and were exhumed in major structures controlling basin formation; and (4) resulting from Mesozoic magmatism (~145 Ma) with a stronger imprint in the west Atlantic margin.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42212461","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
Accretionary orogenesis triggered by collision across continent distance: Evidence from the Proto‐Tethyan West Kunlun, China 跨大陆距离碰撞引发的增生造山作用:来自原特提斯西昆仑的证据
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2023-01-10 DOI: 10.1111/ter.12643
Yan-Jun Wang, Weiguang Zhu, Zhenghong Zhang, Kang Yang, Chengquan Wu, Jinhong Xu, Chengbiao Leng, Jian‐Bing Xu
{"title":"Accretionary orogenesis triggered by collision across continent distance: Evidence from the Proto‐Tethyan West Kunlun, China","authors":"Yan-Jun Wang, Weiguang Zhu, Zhenghong Zhang, Kang Yang, Chengquan Wu, Jinhong Xu, Chengbiao Leng, Jian‐Bing Xu","doi":"10.1111/ter.12643","DOIUrl":"https://doi.org/10.1111/ter.12643","url":null,"abstract":"Proto‐Tethyan orogenic processes prior to the late Ordovician collision remain unclear. Both whole‐rock La/Yb‐ and zircon Eu/Eu*‐based crustal thickness proxies along with petrological and geological observations were used to reconstruct mountain‐building history for the West Kunlun orogenic belt, China, over the span of Early Palaeozoic. Here, we demonstrate that Proto‐Tethyan West Kunlun crust has observed significant accretionary orogeneses at 520–480 Ma and 480–450 Ma and collisional orogenesis at 450–400 Ma. The 520–480 Ma accretionary orogenesis in West Kunlun together with the coeval Delamerian accretionary contractional orogenesis in eastern Australia were simultaneously induced by continent‐continent collisions that welded the Gondwana landmass. Ca. 440 Ma docking of Tarim and its eastern neighbouring blocks along the northern margin of Gondwana in turn triggered the Lachlan accretionary orogenesis along the opposite margin. This study highlights that accretionary orogenesis could be a manifestation of far‐field compressional stress from continent‐continent collision.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44124169","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
Issue Information 问题信息
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2023-01-02 DOI: 10.1111/ter.12601
{"title":"Issue Information","authors":"","doi":"10.1111/ter.12601","DOIUrl":"https://doi.org/10.1111/ter.12601","url":null,"abstract":"","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45201745","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
Loss of loess in the geological record due to poor preservation 黄土在地质记录中因保存不善而流失
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2022-12-31 DOI: 10.1111/ter.12642
N. Meijer, B. van der Meulen
{"title":"Loss of loess in the geological record due to poor preservation","authors":"N. Meijer, B. van der Meulen","doi":"10.1111/ter.12642","DOIUrl":"https://doi.org/10.1111/ter.12642","url":null,"abstract":"Loess deposits are widespread in the Quaternary, but relatively rare in older geological records. This disparity is commonly linked to the unique climate conditions of the Quaternary, but those cannot fully explain the scarcity of loess in older records. Instead, we propose that the poor preservation of loess also plays an essential role. To test this hypothesis, we assess the preservation potential of loess by quantifying its modern‐day distribution in active sedimentary basins. This analysis shows that on the global scale only 20% of loess occurs in basins of which the majority is in a foreland setting. This could be due to nearby silt‐producing mountains and the effects of rain shadow aridity. The other 80% is ultimately either eroded or reworked and therefore poorly preserved in the long term. This conclusion implies that loess deposits may have been more common in pre‐Quaternary periods, despite being less abundant in the geological record.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43979007","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: 1
Large landslide of the hyperarid Central Western Andes triggered during a humid period of the Late Pleistocene (ca. 19°S; northern Chile) 在更新世晚期（约19°S；智利北部）的潮湿时期，安第斯山脉中西部超干旱地区发生了大型滑坡
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2022-12-28 DOI: 10.1111/ter.12641
S. Zerathe, L. Audin, X. Robert, S. Schwartz, J. Carcaillet
{"title":"Large landslide of the hyperarid Central Western Andes triggered during a humid period of the Late Pleistocene (ca. 19°S; northern Chile)","authors":"S. Zerathe, L. Audin, X. Robert, S. Schwartz, J. Carcaillet","doi":"10.1111/ter.12641","DOIUrl":"https://doi.org/10.1111/ter.12641","url":null,"abstract":"The western flank of the Central Andes offers a unique geomorphological record of large paleolandslides that are well preserved on long time‐scales (i.e. ≥Pleistocene) due to the long‐lasting aridity of this region. However, the lack of chronological constraints on those landslides limits our understanding of the respective role of tectonics and climate on their triggering. Here, we report new 10Be surface exposure dating obtained on one of those giant slope‐failures: the Limaxina landslide (northern Chile, 19°S). Five tightly grouped exposure‐ages (one outlier discarded) point to a single landslide failure at 80 ± 4 ka. This timing being consistent with others local records of a wet episode in the Atacama Desert, it suggests a primary role of climate‐forcing on landslide activity in this region, calling to further slope failures dating in the arid Central western Andes to explore landscapes responses to Quaternary climate oscillations and extreme events.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45309959","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
Was Baltica part of Rodinia? 波罗的海是罗丁尼亚的一部分吗?
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2022-12-20 DOI: 10.1111/ter.12640
T. Slagstad, E. Kulakov, M. Anderson, K. Saalmann, C. Kirkland, I. Henderson, M. Ganerød
{"title":"Was Baltica part of Rodinia?","authors":"T. Slagstad, E. Kulakov, M. Anderson, K. Saalmann, C. Kirkland, I. Henderson, M. Ganerød","doi":"10.1111/ter.12640","DOIUrl":"https://doi.org/10.1111/ter.12640","url":null,"abstract":"Late Ediacaran opening of the Iapetus Ocean is typically considered to reflect separation of Baltica and Laurentia during final breakup of the Rodinia supercontinent, with subsequent closure during the Caledonian Orogeny. However, evidence of the pre‐opening juxtaposition of Baltica and Laurentia is limited to purportedly similar apparent polar wander paths and correlation of Rodinia‐forming orogenic events. We show that a range of existing data do not unequivocally support correlation of these orogens, and that geologic and palaeomagnetic data instead favour separation of Baltica and Laurentia as early as 1.1–1.2 Ga. Furthermore, new detrital zircon U–Pb age and Ar–Ar thermochronological data from Norway point towards an active western Baltican margin throughout most of the Neoproterozoic and early Palaeozoic. These findings are inconsistent with the majority of palaeogeographic reconstructions that place Baltica near the core of the Rodinia supercontinent.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44234812","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
Anomalous weathering records in the Cleveland Basin (Yorkshire, UK) during the T‐OAE global warming T‐OAE全球变暖期间克利夫兰盆地（英国约克郡）的异常风化记录
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2022-12-10 DOI: 10.1111/ter.12639
Yunfeng Wang
{"title":"Anomalous weathering records in the Cleveland Basin (Yorkshire, UK) during the T‐OAE global warming","authors":"Yunfeng Wang","doi":"10.1111/ter.12639","DOIUrl":"https://doi.org/10.1111/ter.12639","url":null,"abstract":"Early Toarcian (~183 Ma) was marked by a global warming event which accelerated continental chemical weathering. To constrain the early Toarcian weathering intensity of a Cleveland Basin (Yorkshire, UK) region, this study employed its sediment chemical weathering proxies (potassium/aluminium (K/Al) and K/rubidium (K/Rb)). The K/Al and K/Rb exhibit an anomalous chemical weathering intensity signal from the contemporaneous warm, moist world. Variations in weathering intensity for the Yorkshire section inversely comply with detrital grain size changes (indicated by Al/silicon (Al/Si)). This finding implies that continental chemical weathering did not play a major role in changing detrital grain sizes in the Yorkshire sediments. Instead, short‐term sea‐level changes in the Cleveland Basin can explain the stratigraphic variations in detrital grain sizes. Anomalies of geochemical proxies for chemical weathering and eustatic sea‐level changes do exist at local scales possibly driven by Milankovitch cycle, which reminds us to be more careful when reconstructing palaeoclimate states.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49505602","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
A Jurassic volcanic passive margin in Iran and Turkey 伊朗和土耳其侏罗纪火山被动边缘
IF 2.4 3区 地球科学
Terra Nova Pub Date : 2022-12-02 DOI: 10.1111/ter.12638
H. Azizi, R. Stern, Raif Kandemir, O. Karslı
{"title":"A Jurassic volcanic passive margin in Iran and Turkey","authors":"H. Azizi, R. Stern, Raif Kandemir, O. Karslı","doi":"10.1111/ter.12638","DOIUrl":"https://doi.org/10.1111/ter.12638","url":null,"abstract":"Broadly similar Early to Middle Jurassic stratigraphic sequences including bimodal igneous rocks of the Sanandaj–Sirjan Zone of Iran and the Sakarya Zone of Turkey suggest that these formed in a common tectonic setting in an extensional basin that evolved from a terrestrial magmatic rift to a marine shelf and passive continental margin. Whole‐rock chemistry and Sr–Nd isotope signatures indicate derivation of mafic melts from partial melting of the subcontinental lithosphere. Decompression associated with extension led to 5%–30% partial melting of spinel–garnet lherzolite with minor involvement of continental crust, producing tholeiitic to transitional basaltic magma. Extensional basins inverted during the Mid‐Late Jurassic. These relationships suggest the Early to Middle Jurassic formation of a volcanic rifted margin on the SW Eurasian margin, similar to that of offshore Norway.","PeriodicalId":22260,"journal":{"name":"Terra Nova","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2022-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47524493","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: 4
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