| Continental velocity through Precambrian times: The link to magmatism, crustal accretion and episodes of global cooling |
| |
| 作者姓名： | J.D.A.Piper |
| |
| 作者单位： | Geomagnetism Laboratory,Geology and Geophysics,School of Environmental Sciences,University of Liverpool.Liverpool L69 7ZE,UK |
| |
| 基金项目： | Acknowledgements I am very grateful to Kay Lancaster for drafting the figures for this paper and Alan McCormack for assistance with the calcula- tions. I am also grateful to Professor M. Santosh, Executive Vice Editor-in-Chief of Geoscience Frontiers, and an anonymous referee for comments which helped to improve the paper. |
| |
| 摘 要： | Quasi-integrity of continental crust between Mid-Archaean and Ediacaran times is demonstrated by conformity of palaeomagnetic poles to near-static positions between～2.7-2.2 Ca,～1.5-1.2 Ga and～0.75-0.6 Ga.Intervening data accord to coherent APW loops turning at "hairpins" focused near a continental-centric location.Although peripheral adjustments occurred during Early Proterozoic （～2.2 Ga） and Grenville（～1.1 Ga） times,the crust retained a low order symmetrical crescent-shaped form constrained to a single global hemisphere until break-up in Ediacaran times.Conformity of palaeomagnetic data to specific Eulerian parameters enables definition of a master Precambrian APW path used to estimate the root mean square velocity(vRMS) of continental crust between 2.8 and 0.6 Ga.A long interval of little polar movement between～2.7 and 2.2 Ga correlates with global magmatic shutdown between～2.45 and 2.2 Ga,whilst this interval and later slowdown at～0.75-0.6 Ga to velocities of <2 cm/year correlate with episodes of widespread glaciation implying that these prolonged climatic anomalies had an internal origin;the reduced input of volcanically-derived atmospheric greenhouse gases is inferred to have permitted freeze-over conditions with active ice sheets extending into equatorial latitudes as established by low magnetic inclinations in glaciogenic deposits.vRMS variations through Precambrian times correspond to the distribution of U-Pb ages in orogenic granitoids and detrital zircons and demonstrate that mobility of continental crust has been closely related to crustal tectonism and incrementation.Both periods of near-stillstand were followed by rapid vRMS recording massive heat release from beneath the continental lid at～2.2 and 0.6 Ga.The first coincided with the Lomagundi-Jatuli isotopic event and led to prolonged orogenesis accompanied by continental flooding and reconfiguration of the crust on the Earth’s surface;the second led to continental break-up and instigated the comprehensive Plate Tectonics that has characterised Phanerozoic times.The Mesoproterozoic interval characterised by anorogenic magmatism correlates with low vRMS between～1.5 and 1.1 Ga.Insulation of the sub-continental mantle evidently permitted high temperature melting and weakening of the crustal lid to enable buoyant emplacement of large plutons at high crustal levels during this magmatic event unique to Mesoproterozoic and early Neoproterozoic times.
|
| 关 键 词： | 均方根速度 岩浆活动 地壳增生 前寒武纪 冷事件 锆石U-Pb年龄 地壳构造运动 大陆地壳 |
| 收稿时间： | 23 March 2012 |
http://www.sciencedirect.com/science/article/pii/S1674987112000679 |
| |
| J.D.A.Piper.Continental velocity through Precambrian times: The link to magmatism, crustal accretion and episodes of global cooling[J].Geoscience Frontiers,2013,4(1):7-36. |
| |
| Authors: | ,
JDAPiper |
| |
| Institution: | Geomagnetism Laboratory, Geology and Geophysics, School of Environmental Sciences, University of Liverpool, Liverpool L69 7ZE, UK |
| |
| Abstract: | Quasi-integrity of continental crust between Mid-Archaean and Ediacaran times is demonstrated by conformity of palaeomagnetic poles to near-static positions between ～2.7–2.2 Ga, ～1.5–1.2 Ga and ～0.75–0.6 Ga. Intervening data accord to coherent APW loops turning at “hairpins” focused near a continental-centric location. Although peripheral adjustments occurred during Early Proterozoic (～2.2 Ga) and Grenville (～1.1 Ga) times, the crust retained a low order symmetrical crescent-shaped form constrained to a single global hemisphere until break-up in Ediacaran times. Conformity of palaeomagnetic data to specific Eulerian parameters enables definition of a master Precambrian APW path used to estimate the root mean square velocity (vRMS) of continental crust between 2.8 and 0.6 Ga. A long interval of little polar movement between ～2.7 and 2.2 Ga correlates with global magmatic shutdown between ～2.45 and 2.2 Ga, whilst this interval and later slowdown at ～0.75–0.6 Ga to velocities of <2 cm/year correlate with episodes of widespread glaciation implying that these prolonged climatic anomalies had an internal origin; the reduced input of volcanically-derived atmospheric greenhouse gases is inferred to have permitted freeze-over conditions with active ice sheets extending into equatorial latitudes as established by low magnetic inclinations in glaciogenic deposits. vRMS variations through Precambrian times correspond to the distribution of U-Pb ages in orogenic granitoids and detrital zircons and demonstrate that mobility of continental crust has been closely related to crustal tectonism and incrementation. Both periods of near-stillstand were followed by rapid vRMS recording massive heat release from beneath the continental lid at ～2.2 and 0.6 Ga. The first coincided with the Lomagundi-Jatuli isotopic event and led to prolonged orogenesis accompanied by continental flooding and reconfiguration of the crust on the Earth's surface; the second led to continental break-up and instigated the comprehensive Plate Tectonics that has characterised Phanerozoic times. The Mesoproterozoic interval characterised by anorogenic magmatism correlates with low vRMS between ～1.5 and 1.1 Ga. Insulation of the sub-continental mantle evidently permitted high temperature melting and weakening of the crustal lid to enable buoyant emplacement of large plutons at high crustal levels during this magmatic event unique to Mesoproterozoic and early Neoproterozoic times. |
| |
| Keywords: | Continental velocity Precambrian Palaeopangaea Palaeomagnetism Magmatism Tectonics |
| 本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录！ |
| 点击此处可从《地学前缘(英文版)》浏览原始摘要信息 |
| 点击此处可从《地学前缘(英文版)》下载免费的PDF全文 |
