Journal ArticleDOI
Linking continental deep subduction with destruction of a cratonic margin: strongly reworked North China SCLM intruded in the Triassic Sulu UHP belt
Jianping Zheng,Jianping Zheng,Huayun Tang,Qing Xiong,Qing Xiong,William L. Griffin,Suzanne Y. O'Reilly,Norman J. Pearson,Jun-Hong Zhao,Yuan-Bao Wu,Junfeng Zhang,Yongsheng Liu +11 more
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TLDR
In this article, the authors used peridotites along the southern margin of the Sulu UHP terrane to understand the evolution of continental cratons and their margins and showed that the deep lithosphere of the cratonic margin experienced Proterozoic metasomatic modification, followed by a strong Early Mesozoic (~470 Ma) tectonothermal event and the Early Mesogeneic collision and northward subduction of the Yangtze craton.Abstract:
The collision between the North and South China cratons in Middle Triassic time (240–225 Ma) created the world’s largest belt of ultrahigh-pressure (UHP) metamorphism. U–Pb ages, Hf isotope systematics and trace element compositions of zircons from the Xugou, Yangkou and Hujialing peridotites in the Sulu UHP terrane mainly record a ~470 Ma tectonothermal event, coeval with the Early Paleozoic kimberlite eruptions within the North China craton. This event is interpreted as the result of metasomatism by fluids/melts derived from multiple sources including a subducting continental slab. The peridotites also contain zircons with ages of ~3.1 Ga, and Hf isotope data imply a component ≥3.2 Ga old. Most zircon Hf depleted mantle model ages are ~1.3 Ga, suggesting that the deep subcontinental lithospheric mantle beneath the southeastern margin of the North China craton experienced a intense mid-Mesoproterozoic metasomatism by asthenospheric components, similar to the case for the eastern part of this craton. Integrating data from peridotites along the southern margin of the craton, we argue that the deep lithosphere of the cratonic margin (≥3.2 Ga old), from which the Xugou, Yangkou and Hujialing peridotites were derived, experienced Proterozoic metasomatic modification, followed by a strong Early Paleozoic (~470 Ma) tectonothermal event and the Early Mesozoic (~230 Ma) collision and northward subduction of the Yangtze craton. The Phanerozoic decratonization of the eastern North China craton, especially along its southern margin, was not earlier than the Triassic continental collision. This work also demonstrates that although zircons are rare in peridotitic rocks, they can be used to unravel the history of specific lithospheric domains and thus contribute to our understanding of the evolution of continental cratons and their margins.read more
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Zircon: The Metamorphic Mineral
Daniela Rubatto,Daniela Rubatto +1 more
TL;DR: Metamorphic zircon is no longer an impediment to precise geochronology of protolith rocks, but has become a truly indispensable mineral in reconstructing pressure-temperature-time-fluid-paths over a wide range of settings.
Journal ArticleDOI
Silicic magma reservoirs in the Earth's crust
Olivier Bachmann,Christian Huber +1 more
TL;DR: In this article, the authors focus on recent claims that magma columns within the Earth's crust are mostly kept at high crystallinity (mush zones) and that the dynamics within those mush columns, albeit modulated by external factors (e.g., regional stress field, rheology of the crust, pre-existing tectonic structure), play an important role in controlling how magmas evolve, degas, and ultimately erupt.
Journal ArticleDOI
Subduction zone geochemistry
TL;DR: In this article, the authors classified oceanic basalts into two types in terms of their trace element distribution patterns in the primitive mantle normalized diagram: island arc basalts and ocean island basalts (OIB), showing enrichment in LILE, Pb and LREE but depletion in HFSE such as Nb and Ta relative to HREE.
Journal ArticleDOI
Expanding the role of reactive transport models in critical zone processes
Li Li,Kate Maher,Alexis Navarre-Sitchler,Jennifer L. Druhan,Christof Meile,Corey R. Lawrence,Joel Moore,Julia Perdrial,Pamela L. Sullivan,Aaron Thompson,Lixin Jin,Edward W. Bolton,Susan L. Brantley,William E. Dietrich,K. Ulrich Mayer,Carl I. Steefel,Albert J. Valocchi,John M. Zachara,Benjamin D. Kocar,Jennifer C. McIntosh,Benjamin M. Tutolo,Mukesh Kumar,Eric Sonnenthal,Chen Bao,Joe Beisman +24 more
TL;DR: A review of multi-component Reactive Transport Models (RTMs) can be found in this article, where the authors present seven testable hypotheses that emphasize the unique capabilities of process-based RTMs for elucidating chemical weathering and its physical and biogeochemical drivers; understanding the interactions among roots, micro-organisms, carbon, water, and minerals in the rhizosphere; assessing the effects of heterogeneity across spatial and temporal scales; and integrating the vast quantity of novel data (genomics, transcriptomics, proteomics, metabolomics), elemental concentration and speciation
Journal ArticleDOI
Experimental melts from crustal rocks: A lithochemical constraint on granite petrogenesis
TL;DR: In this paper, a compilation and synthesis of available experimental data for the major element compositions of felsic melts derived from partial melting of natural or synthetic materials in the compositional range of crustal rocks is presented.
References
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Journal ArticleDOI
The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U–Pb zircon geochronology
TL;DR: In this paper, a laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) was used for in situ U-Pb zircon geochronology.
Journal ArticleDOI
Correction of common lead in U-Pb analyses that do not report 204Pb
TL;DR: In this article, the authors proposed a correction method that neither uses 204Pb nor assumes concordance, but uses a numeric solution to a set of equations relating the content of radiogenic lead in a zircon or other U/Th-enriched mineral to its total lead content.
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The Hf isotope composition of cratonic mantle: LAM-MC-ICPMS analysis of zircon megacrysts in kimberlites
William L. Griffin,William L. Griffin,Norman J. Pearson,Elena Belousova,Simon E. Jackson,E. van Achterbergh,Suzanne Y. O'Reilly,S. R. Shee +7 more
TL;DR: In this article, the isotopic composition of Hf has been measured in 124 mantle-derived zircon megacrysts from African, Siberian and Australian kimberlites, using a laser-ablation microprobe (LAM) and a multi-collector ICPMS.
Journal ArticleDOI
Zircon chemistry and magma mixing, SE China: In-situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes
William L. Griffin,William L. Griffin,Xiang Wang,Xiang Wang,Simon E. Jackson,Norman J. Pearson,Suzanne Y. O'Reilly,Xisheng Xu,Xisheng Xu,Xinmin Zhou +9 more
TL;DR: In this article, in-situ LAM-MC-ICPMS microanalysis shows large variations in 176Hf/177Hf (up to 15 eHf units) between zircons of different growth stages within a single rock, and between zones within single zircon grains, suggesting that each of the observed magmas in both complexes developed through hybridisation of ≥2 magmas with different sources.
Journal ArticleDOI
Calibration of the lutetium-hafnium clock.
TL;DR: The existence of strongly unradiogenic hafnium in Early Archean and Hadean zircons implies that enriched crustal reservoirs existed on Earth by 4.3 billion years ago and persisted for 200 million years or more, and current models of early terrestrial differentiation need revision.