Evolution and composition of the lithospheric mantle underneath the western Arabian peninsula: constraints from Sr?Nd isotope systematics of mantle xenoliths

1990 ◽  
Vol 105 (4) ◽  
pp. 460-472 ◽  
Author(s):  
Friedhelm Henjes-Kunst ◽  
Rainer Altherr ◽  
Albrecht Baumann
Keyword(s):  
Lithospheric Mantle ◽  
Arabian Peninsula ◽  
Mantle Xenoliths ◽  
Nd Isotope ◽  
Isotope Systematics

scholarly journals Distribution of Mantle and Atmospheric Argon in Mantle Xenoliths from the Western Arabian Peninsula: Constraints on Timing and Composition of Metasomatizing Agents in the Lithospheric Mantle

2010 ◽  
Vol 51 (12) ◽  
pp. 2547-2570 ◽  
Author(s):  
A. I. Buikin ◽  
M. Trieloff ◽  
E. V. Korochantseva ◽  
J. Hopp ◽  
M. Kaliwoda ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Arabian Peninsula ◽  
Mantle Xenoliths ◽  
Atmospheric Argon

scholarly journals Major-trace element and Sr-Nd isotope compositions of mafic dykes of the Singhbhum Craton: Insights into evolution of the lithospheric mantle

Lithos ◽  
2021 ◽  
Vol 382-383 ◽  
pp. 105959
Author(s):  
Om Prakash Pandey ◽  
Klaus Mezger ◽  
Dewashish Upadhyay ◽  
Debajyoti Paul ◽  
Ajay Kumar Singh ◽  
...  
Keyword(s):  
Trace Element ◽  
Lithospheric Mantle ◽  
Nd Isotope ◽  
Mafic Dykes ◽  
Singhbhum Craton

Mineral ages and zircon Hf isotopic composition of the Andong ultramafic complex: implications for the evolution of Mesozoic subduction system and subcontinental lithospheric mantle beneath SE Korea

2013 ◽  
Vol 151 (5) ◽  
pp. 765-776 ◽  
Author(s):  
GI YOUNG JEONG ◽  
CHANG-SIK CHEONG ◽  
KEEWOOK YI ◽  
JEONGMIN KIM ◽  
NAMHOON KIM ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Tectonic Setting ◽  
Eastern China ◽  
Mantle Xenoliths ◽  
Late Triassic ◽  
Magmatic Differentiation ◽  
Suprasubduction Zone ◽  
Ultramafic Complex ◽  
Yeongnam Massif ◽  
Subduction System

AbstractThe Phanerozoic subduction system of the Korean peninsula is considered to have been activated by at least Middle Permian time. The geochemically arc-like Andong ultramafic complex (AUC) occurring along the border between the Precambrian Yeongnam massif and the Cretaceous Gyeongsang back-arc basin provides a rare opportunity for direct study of the pre-Cretaceous mantle wedge lying above the subduction zone. The tightly constrained SHRIMP U–Pb age of zircons extracted from orthopyroxenite specimens (222.1±1.0 Ma) is indistinguishable from the Ar/Ar age of coexisting phlogopite (220±6 Ma). These ages represent the timing of suprasubduction zone magmatism likely in response to the sinking of cold and dense oceanic lithosphere and the resultant extensional strain regime in a nascent arc environment. The nearly coeval occurrence of a syenite-gabbro-monzonite suite in the SW Yeongnam massif also suggests an extensional tectonic setting along the continental margin side during Late Triassic time. The relatively enriched ɛHf range of dated zircons (+6.2 to −0.6 at 222 Ma) is in contrast to previously reported primitive Sr–Nd–Hf isotopic features of Cenozoic mantle xenoliths from Korea and eastern China. This enrichment is not ascribed to contamination by the hypothetical Palaeozoic crust beneath SE Korea, but is instead attributable to metasomatism of the lithospheric mantle during the earlier subduction of the palaeo-Pacific plate. Most AUC zircons show a restricted core-to-rim spread of ɛHf values, but some grains testify to the operation of open-system processes during magmatic differentiation.

Non-linear dynamics, chaos, complexity and enclaves in granitoid magmas

1996 ◽  
Vol 87 (1-2) ◽  
pp. 217-223 ◽  
Author(s):  
James Flinders ◽  
John D. Clemens
Keyword(s):  
Deterministic Chaos ◽  
Interfacial Area ◽  
Two Dimensions ◽  
Mixing Processes ◽  
Nd Isotope ◽  
Natural Systems ◽  
Non Linear ◽  
The Difference ◽  
Magma System ◽  
Isotope Systematics

ABSTRACT:Most natural systems display non-linear dynamic behaviour. This should be true for magma mingling and mixing processes, which may be chaotic. The equations that most nearly represent how a chaotic natural system behaves are insoluble, so modelling involves linearisation. The difference between the solution of the linearised and ‘true’ equation is assumed to be small because the discarded terms are assumed to be unimportant. This may be very misleading because the importance of such terms is both unknown and unknowable. Linearised equations are generally poor descriptors of nature and are incapable of either predicting or retrodicting the evolution of most natural systems. Viewed in two dimensions, the mixing of two or more visually contrasting fluids produces patterns by folding and stretching. This increases the interfacial area and reduces striation thickness. This provides visual analogues of the deterministic chaos within a dynamic magma system, in which an enclave magma is mingling and mixing with a host magma. Here, two initially adjacent enclave blobs may be driven arbitrarily and exponentially far apart, while undergoing independent (and possibly dissimilar) changes in their composition. Examples are given of the wildly different morphologies, chemical characteristics and Nd isotope systematics of microgranitoid enclaves within individual felsic magmas, and it is concluded that these contrasts represent different stages in the temporal evolution of a complex magma system driven by nonlinear dynamics. If this is true, there are major implications for the interpretation of the parts played by enclaves in the genesis and evolution of granitoid magmas.

Evolution of ca. 2.5 Ga Dongargarh volcano-sedimentary Supergroup, Bastar craton, Central India: Constraints from zircon U-Pb geochronology, bulk-rock geochemistry and Hf-Nd isotope systematics

2019 ◽  
Vol 190 ◽  
pp. 273-309 ◽  
Author(s):  
Tarun C. Khanna ◽  
Michael Bizimis ◽  
David L. Barbeau ◽  
A. Keshav Krishna ◽  
V.V. Sesha Sai
Keyword(s):  
Central India ◽  
Bulk Rock ◽  
Nd Isotope ◽  
Bastar Craton ◽  
Isotope Systematics

scholarly journals Ediacaran–Palaeozoic tectonic evolution of the Ossa Morena and Central Iberian zones (SW Iberia) as revealed by Sm–Nd isotope systematics

2008 ◽  
Vol 461 (1-4) ◽  
pp. 202-214 ◽  
Author(s):  
Rafael López-Guijarro ◽  
Maider Armendáriz ◽  
Cecilio Quesada ◽  
Javier Fernández-Suárez ◽  
J. Brendan Murphy ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Nd Isotope ◽  
Isotope Systematics
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