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Causes of Cretaceous subduction termination below South China and Borneo:Was the Proto-South China Sea underlain by an oceanic plateau?

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Geoscience Frontiers 2024年第2期15卷 100-124页

作者： Suzanna H.A.van de Lagemaat Licheng Cao junaidi Asis Eldert L.Advokaat Paul R.D.Mason mark j.dekkers Douwe j.j.van Hinsbergen Department of Earth Sciences Utrecht UniversityUtrechtthe Netherlands College of Marine Science and Technology China University of GeosciencesWuhanChina Faculty of Science and Natural Resources Universiti Malaysia SabahKota KinabaluMalaysia

The South China,Indochina,and Borneo margins surrounding the South China Sea contain long-lived arcs that became inactive at approximately 85 Ma,even though an embayment of oceanic crust(the‘Proto-South China Sea’)remained in the intervening *** oceanic crust eventually subducted in the Cenozoic below Borneo and the Cagayan arc,while the modern South China Sea opened in its *** investigate the enigmatic cessation of Mesozoic subduction below South China and Borneo,we studied a fragment of oceanic crust and overlying trench-fill sediments that accreted to NW Borneo during the final stages of Paleo-Pacific *** on radiolarian biostratigraphy of cherts overlying the pillow basalts and detrital zircon geochronology of the trench-fill,we constrained the minimum age of the oceanic crust during accretion to 40 *** shows that subduction cessation was not related to ridge *** analysis of pillow basalts revealed an enriched mid-ocean ridge basalt signature comparable to oceanic *** paleomagnetism,we show that this fragment of oceanic crust was not part of the Izanagi Plate but was part of a plate(the‘Pontus’Plate)separated from the Izanagi Plate by a subduction *** on the minimum 40 Ma age of the oceanic crust and its geochemistry,we suggest that Mesozoic subduction below South China and Borneo stopped when an oceanic plateau entered the trench,while the eastern plate margin with the Izanagi Plate remained *** show how our findings offer opportunities to restore plate configurations of the Panthalassa-Tethys junction region.

关键词： Proto-South China Sea Paleomagnetism Geochemistry Borneo Paleo-Pacific Izanagi Plate

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Avalonia,get bent!–Paleomagnetism from SW Iberia confirms the Greater Cantabrian Orocline

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Geoscience Frontiers 2021年第2期12卷 805-825页

作者： Bruno Daniel Leite Mendes Daniel Pastor-Galan mark j.dekkers Wout Krijgsman Paleomagnetic Laboratory Fort Hoofddijk Department of Earth SciencesUtrecht UniversityBudapestlaan 173584CDthe Netherlands Frontier Research Institute for Interdisciplinary Sciences Tohoku UniversityJapan Department Earth Science Tohoku UniversityJapan Center for North East Asia Studies Tohoku University980-857641 KawauchiAoba-kuSendaiMiyagiJapan

The amalgamation of Pangea formed the contorted Variscan-Alleghanian orogen,suturing Gondwana and Laurussia during the *** all swirls of this orogen,a double curve in Iberia stands out,the coupled Cantabrian Orocline and Central Iberian *** Cantabrian Orocline formed at ca.315–290 Ma subsequent to the Variscan *** formation mechanism of the Cantabrian Orocline is disputed,the most commonly proposed mechanisms include either(1)that south-westernmost Iberia would be an Avalonian(Laurussian)indenter or(2)that the stress field changed,buckling the *** contrast,the geometry and kinematics of the Central Iberian curve are largely *** some authors defend both curvatures are genetically linked,others support they are distinct and formed at different *** uncertainty adds an extra layer of complexity to our understanding of the final stages of Pangea’s *** solve these issues,we study the late Carboniferous–early Permian vertical-axis rotations of SW Iberia with *** results show up to 70counterclockwise vertical-axis rotations during late Carboniferous times,concurring with the anticipated kinematics if SW Iberia was part of the southern limb of the Cantabrian *** results do not allow the necessary penecontemporaneous clockwise rotations in Central Iberia to support a concomitant formation of both Cantabrian and Central Iberian *** coherent rotation of both Gondwanan and Avalonian pieces of SW Iberia discards the Laurussian indenter hypothesis as a formation mechanism of the Cantabrian Orocline and confirms the Greater Cantabrian Orocline *** Greater Cantabrian Orocline likely formed as a consequence of a change in the stress field during the late Carboniferous and extended beyond the Rheic Ocean suture affecting the margins of both Laurussia and Gondwana.

关键词： Pangea Variscan orogeny Greater Cantabrian Orocline Paleomagnetism Central Iberian curve

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Triassic (Anisian and Rhaetian) palaeomagnetic poles from the Germanic Basin (Winterswijk, the Netherlands)

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journal of Palaeogeography 2019年第4期8卷 393-407页

作者： Lars P.P.van Hinsbergen Douwe j.j.van Hinsbergen Cor G.Langereis mark j.dekkers Bas Zanderink Martijn H.L.Deenen Fioretti College Sportlaan 32161 VA Lissethe Netherlands Department of Earth Sciences Utrecht UniversityPrincetonlaan 8A3584 CB Utrechtthe Netherlands Twents Carmel College De Thij Thijlaan 307576 ZB Oldenzaalthe Netherlands.

In this paper,we provide two new Triassic palaeomagnetic poles from Winterswijk,the Netherlands,in the stable interior of the Eurasian *** were respectively collected from the Anisian(~247–242 Ma)red marly limestones of the sedimentary transition of the Buntsandstein Formation to the dark grey limestones of the basal Muschelkalk Formation,and from the Rhaetian(~208–201 Ma)shallow marine claystones that unconformably overlie the Muschelkalk *** magnetization is carried by hematite or magnetite in the Anisian limestones,and iron sulfides and magnetite in the Rhaetian sedimentary rocks,revealing for both a large normal polarity overprint with a recent(geocentric axial dipole field)direction at the present latitude of the *** field and thermal demagnetization occasionally reveal a stable magnetization decaying towards the origin,interpreted as the Characteristic Remanent *** we find a pervasive(normal polarity)overprint,we can often still determine well-defined great-circle *** interpreted palaeomagnetic poles include the great-circle *** Anisian magnetic pole has declination D±ΔDx=210.8±3.0°,inclination I±ΔIx=-26.7±4.9°,with a latitude,longitude of 45.0°,142.0°respectively,K=43.9,A95=2.9°,N=*** Rhaetian magnetic pole has declination D±ΔDx=32.0±8.7°,inclination I±ΔIx=50.9±8.1°,with a latitude,longitude of 60.6°,123.9°respectively,K=19.3,A95=7.4°,N=*** poles plot close to the predicted location of global apparent polar wander paths(GAPWa Ps)in Eurasian coordinates and are feasible for future apparent polar wander path *** confirm that the intracontinental,shallow-marine Germanic Basin,in which the Muschelkalk Formation was deposited,existed at a palaeolatitude of 14.1°[11.3,17.1]N,in a palaeo-environment reminding of the Persian Gulf *** Rhaetian times,palaeolatitudes of 31.6°[24.8,39.8]N were reached,on its way to the modern latitude of 52°N.

关键词： Palaeomagnetic Palaeolatitude Anisian Rhaetian Muschelkalk Formation Germanic Basin

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Astronomical dating of the Xiantai,Donggutuo and Maliang Paleolithic sites in the Nihewan Basin(North China) and implications for early human evolution in East Asia

Astronomical dating of the Xiantai,Donggutuo and Maliang Pal...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： mark j.dekkers Paleomagnetic Laboratory’Fort Hoofddijk’ Department of Earth SciencesFaculty of GeosciencesUtrecht UniversityBudapestlaan 173584 CD UtrechtThe Netherlands

Magnetostratigraphic studies have established a first-order chronological framework for the Paleolithic sites in the Nihewan Basin(North China),which enabled tracking early human evolution in East ***,to fully understand how well early humans were adapted to climate change,a truly precise dating of the Paleolithic sites is ***,we established a high-resolution astronomical timescale for the Xiantai and Donggutuo fluvio-lacustrine successions at the eastern margin of the Nihewan Basin employing low-field magnetic susceptibility(χ)as a climatic indicator,aiming to further refine the ages of the Xiantai, Donggutuo and Maliang Paleolithic *** from an initial age model constrained by geomagnetic reversals,larger-scaleχcycles were firstly tuned to orbital obliquity using an automatic orbital tuning *** first-order tuning was followed by simultaneously tuningχto both obliquity and precession. The finally tunedχrecords can be correlated almost cycle-by-cycle with the quartz grain-size record of the Chinese loess sequence and the marineδO *** astronomically estimated age of the Xiantai Paleolithic site is ca.1.48 Ma,corresponding to paleosol layer Sof the Chinese loess sequences or marine oxygen isotope stage(MIS)49,an interglacial *** astronomical estimate for the Donggutuo Paleolithic site ranges from-1.06 Ma to 1.12 Ma,corresponding to paleosol/loess layers S-Sor MIS 31- 33,spanning both interglacial and glacial *** astronomically estimated age of the Maliang Paleolithic site is-0.79 Ma,corresponding to loess layer L or MIS 20,a glacial *** astronomical finding further implies that early humans may have permanently occupied China as far north as 40°N since at least 1.1 Ma,and before this time the occupation may be intermittent.

关键词： Astronomical chronology Paleolithic site Nihewan Basin Pleistocene Human evolution

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Magnetic mineral dissolution in Pleistocene fluvio-lacustrine sediments,Nihewan Basin(North China)

Magnetic mineral dissolution in Pleistocene fluvio-lacustrin...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： mark j.dekkers Paleomagnetic Laboratory’Fort Hoofddijk’ Department of Earth SciencesFaculty of GeosciencesUtrecht UniversityBudapestlaan 173584 CD UtrechtThe Netherlands

The Nihewan fluvio-lacustrine sequence(North China)has recorded late Pliocene-Pleistocene climatic and environmental changes,and contains valuable information on early human evolution in high-latitude East *** carried out a combined mineral-magnetic and geochemical investigation on a sequence from the Xiantai section,eastern Nihewan *** suggest that large-amplitude magnetic-property variations between so-called ’high-magnetic’ and ’low-magnetic’ units mainly result from preservation/dissolution cycles of detrital magnetic minerals in alternating oxic and anoxic depositional *** our preservation/dissolution model,the high-and low-magnetic units represent glacial and interglacial deposits, *** contributes to a better understanding of the link between magnetic properties and climate in the Xiantai fluvio-lacustrine *** upon this relationship,early humans may have occupied the Xiantai and Xiaochangliang sites during an interglacial period,during both interglacial and glacial periods at the Donggutuo site,and during a glacial period at the Maliang *** work provides a paleoenvironmental context for early human adaptation and occupation in mainland East Asia during the early Pleistocene.

关键词： environmental magnetism dissolution Nihewan Basin Pleistocene fluvio-lacustrine sediment

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Pleistocene environmental evolution in the Nihewan Basin and implication for early human colonization of North China

Pleistocene environmental evolution in the Nihewan Basin and...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： mark j.dekkers Paleomagnetic Laboratory ’Fort Hoofddijk’ Department of Earth SciencesFaculty of GeosciencesUtrecht UniversityBudapestlaan 173584 CD UtrechtThe Netherlands

The fluvio-lacustrine sequence in the Nihewan Basin is an important archive of Pleistocene climate and environmental changes in northern China,which provides excellent sources of early human settlements in high-latitude East *** a long-term environmental record from the Pleistocene fluvio-lacustrine sequence in this basin is revealed,based on selected major element pairs that are sensitive to paleo-environmental *** reveal a long-term increasing trend in aridification/cooling in the Nihewan Basin since the early *** provides a general setting for early human colonization in high-latitude northern China(around 40°N).The intensified aridification/cooling is envisaged to reduce tree cover and increase open savanna grass ***,in turn,would promote prominent flourishing population and migration of savanna-adapted early humans in the Old ***,the cold/dry climate may have contributed to the evolution and expansion of early humans in the high-latitude northern China,rather than bringing hardship,as is often thought.

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Thermal decomposition to pyrrhotite:New evidence of seismic slip in pyrite-bearing fault zones at the japan Trench

Thermal decomposition to pyrrhotite:New evidence of seismic ...

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2016中国地球科学联合学术年会

作者：杨涛 mark j.dekkers 中国地震局地球物理研究所 Paleomagnetic Laboratory Fort Hoofddijk Department of Earth Sciences Utrecht University

A common problem encountered in fault-zone studies is the difficulty in finding geological records of seismic fault slip and locating seismic slip zones(Cowan,1999),especially in sedimentary ***,it is well known that ...

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南海5Ma以来沉积物的轨道调谐时间标尺与季风演化记录

南海5Ma以来沉积物的轨道调谐时间标尺与季风演化记录

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中国地球物理学会第二十七届年会

作者：敖红 mark j.dekkers 秦利肖国桥中国科学院地球环境研究所 Paleomagnetic Laboratory 'Fort Hoofddijk' Department of Earth SciencesFaculty of GeosciencesUtrecht UniversityBudapestlaan 173584 CD UtrechtThe Netherlands 重庆中国三峡博物馆中国地质大学

＜正＞南海作为西太平洋最大的边缘海,冬季在东北风的驱动下形成逆时针表层洋流,沉积亚洲内陆风蚀作用带来的粉尘;而夏季在东南风的驱动下形成顺时针表层洋流,接受邻近陆地高降雨量产生的风化剥蚀产物。因此,南海新生代沉积物为研究低... 详细信息

＜正＞南海作为西太平洋最大的边缘海,冬季在东北风的驱动下形成逆时针表层洋流,沉积亚洲内陆风蚀作用带来的粉尘;而夏季在东南风的驱动下形成顺时针表层洋流,接受邻近陆地高降雨量产生的风化剥蚀产物。因此,南海新生代沉积物为研究低纬亚洲季风形成和演化提供了理想材料。1999年,以"东亚季风历史在南海的记录及其对全球气候的影响"为主题的大洋钻探（ODP）第184航次在南海展开,实现了中国海区深海科学钻探零的突破。南海大洋钻探的结果,取得了3200多万年来的深海沉积记录,是西太平洋区最佳深海地

关键词：海洋沉积物轨道调谐地质年代演化特征

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Magnetic enhancement and softening of fault gouges during seismic slip: Laboratory observation and implications

Magnetic enhancement and softening of fault gouges during se...

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2017中国地球科学联合学术年会

作者：杨涛 jianye Chen mark j.dekkers Institute of Geophysics and Geomatics China University of Geosciences Department of Earth Sciences Utrecht University

＜正＞Anomalous rock magnetic properties have been reported in slip zones of many previous earthquakes（e.g.,the 1995 Kobe earthquake,japan;the 1999 Chi-Chi earthquake,Chinese Taiwan,and the 2008 Wenchuan earthquake,China）.However,it is unclear whether short-duration frictional heating can actually induce such rock magnetic anomalies in fault zones

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Eccentricity-paced monsoon variability on the northeastern Tibetan Plateau in the late Oligocene high CO2 world

Eccentricity-paced monsoon variability on the northeastern T...

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作者： Hong Ao Diederik Liebrand mark j.dekkers Peng Zhang Yougui Song

Earth experienced sustained cooling since the Early Eocene Climate Optimum and transitioned, at the Eocene–Oligocene transition （EOT;4 million years ago, Ma）, from a warm Greenhouse state with no permanent ice sheets on both poles, to a cooler, but still warmer than today, unipolar Icehouse state with the sole continental-scale ice sheet on Antarctica.

关键词： Eccentricity-paced monsoon variability on the northeastern Tibetan Plateau in the late Oligocene high CO2 world

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