scholarly journals Sr, Nd, C and O isotopic compositions of carbonatite and peralkaline silicate rocks from the Zhidoy complex, Russia. Evidence for binary mixing, liquid immiscibility and a heterogeneous depleted mantle source region.

2000 ◽  
Vol 95 (7) ◽  
pp. 162-172 ◽  
Author(s):  
Toshiro MORIKIYO ◽  
Kana TAKANO ◽  
Takashi MIYAZAKI ◽  
Hiroo KAGAMI ◽  
Nikolai V. VLADYKIN
Keyword(s):  
Mantle Source ◽  
Source Region ◽  
Liquid Immiscibility ◽  
Isotopic Compositions ◽  
Mantle Source Region ◽  
Depleted Mantle ◽  
Binary Mixing ◽  
Silicate Rocks

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

2011 ◽  
Vol 149 (3) ◽  
pp. 459-482 ◽  
Author(s):  
ZHEN LI ◽  
JIAN-SHENG QIU ◽  
XI-SHENG XU
Keyword(s):  
South China ◽  
Mantle Source ◽  
Large Scale ◽  
Genetic Relationships ◽  
Source Region ◽  
Granitic Rocks ◽  
Late Mesozoic ◽  
Isotopic Compositions ◽  
Southeast Coast ◽  
Depleted Mantle

AbstractThe Quanzhou (QZ) and Huacuo (HC) gabbro–granite complexes on the southeast coast of Fujian, South China, are important components of a Late Mesozoic calc-alkaline volcanic–plutonic belt in the region. The complexes provide an excellent opportunity to investigate the genetic relationships between acid and basic magmas, and their interactions within the intrusive environment. The complexes are composed mainly of monzogranite and biotite granodiorite in the QZ complex, and biotite granite in the HC complex, with lesser amounts of hornblende gabbro. Zircon U–Pb dating provides consistent crystallization ages of 109 ± 1 Ma and 108 ± 1 Ma for the QZ gabbros and monzogranites, and an age of 111 ± 1 Ma for the HC gabbro, which is contemporaneous with the spatially associated HC granites. Both the mafic and felsic intrusions in these complexes are enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), and are depleted in high-field-strength elements (HFSEs; e.g. Nb and Ta). They show similarly homogeneous Sr–Nd isotopic compositions. All these factors indicate a close genetic relationship between the gabbroic and granitic rocks in the QZ and HC complexes. Although the enriched Sr–Nd isotopic signatures of the QZ and HC gabbros seemingly point to an enriched mantle source (EM-1), they have highly variable zircon Hf isotopic compositions, with εHf(t) values ranging from negative to positive (specifically –4.6 to +6.1 for the QZ gabbros and –4.8 to +11.6 for the HC gabbros). We interpret the parental basic magmas of these gabbros to have received contributions from a depleted mantle source and crustal components. Contributions from such a depleted mantle source resulted in the growth of juvenile basaltic lower crust, the partial melting of which generated the parental felsic magmas of the QZ and HC complexes. Furthermore, based on a synthesis of petrography, geochronology, elemental and isotopic geochemistry and tectonics, we propose that break-off and rollback of the Late Mesozoic subducted Palaeo-Pacific Plate triggered the upwelling of asthenospheric mantle below the coastal area of the South China Block, which induced extension of the overlying continental lithosphere, and finally initiated the large-scale Late Yanshanian magmatism in the study area.

Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt

Lithos ◽  
2014 ◽  
Vol 204 ◽  
pp. 97-111 ◽  
Author(s):  
Mi-Mi Chen ◽  
Wei Tian ◽  
Katsuhiko Suzuki ◽  
M.-L.-G. Tejada ◽  
Feng-Lin Liu ◽  
...  
Keyword(s):  
Mantle Source ◽  
Source Region ◽  
Flood Basalt ◽  
Nw China ◽  
Mantle Source Region

REE geochemistry of lamprophyres in Baimazhai nickel deposit, Yunnan Province, China: implication for the mantle source region

2005 ◽  
Vol 24 (3) ◽  
pp. 273-279 ◽  
Author(s):  
Tao Guan ◽  
Zhilong Huang ◽  
Cheng Xu ◽  
Zhenliang Zhang ◽  
Zaifei Yan ◽  
...  
Keyword(s):  
Mantle Source ◽  
Yunnan Province ◽  
Source Region ◽  
Nickel Deposit ◽  
Ree Geochemistry ◽  
Mantle Source Region

scholarly journals GRANITOID PETROLOGY OF HAI VAN MASSIF

2009 ◽  
Vol 12 (5) ◽  
pp. 46-54
Author(s):  
Phuc Duc Le
Keyword(s):  
Mantle Source ◽  
Source Region ◽  
Biotite Granite ◽  
Chemical Components ◽  
Isotopic Age ◽  
Mantle Source Region

The granitoid formations of Hai Van massif with petrographical components consist of biotite granite, two mica granite. Chemical components of rocks are: SiO2: 69,34=73,92%, Na2O+KO: 6,11-8,11%, K2O/Na20>1. Content of Ba, Sr is low but Rb is higher. From results of Nd-Sm isotopic analysic shows that they are nearly same with stable crust material. Age of source region formation is 1,33 billion years (model of homogeneous chondrite source region), or 1,95 billion years (model of poor mantle source region). U-Pb isotopic age: 241,9+ 2 and 241,4+2.1 million years.

scholarly journals PETROGRAPHIC, MINERAL, GEOCHEMICAL CHARACTERISTICS OF BA NA GRANITOID

2009 ◽  
Vol 12 (7) ◽  
pp. 58-71
Author(s):  
Phuc Duc Le
Keyword(s):  
Mantle Source ◽  
Source Region ◽  
Isotopic Analysis ◽  
Biotite Granite ◽  
Geochemical Characteristics ◽  
Second Phase ◽  
Granite Sample ◽  
Petrographic Composition ◽  
Fine Grained ◽  
Mantle Source Region

Ba Na granitoid is isometric shape, with exposure of 30 sqa km area. Petrographic composition is mainly coarse - medium grained biotite granite, included in the first phase. The fine grained leuco rock of the second phase is small massif in shape, distributed along fault in NE-SW direction. SiO, content of Bana granitoid is variation from 73.74% to 76.24%. Total of K2O +Na2O is from 7.32% to 8.33%. Ratio of K2O/Na2O: 1.66 - 2.07. This is S-Granite. Value of 147Sm/144Nd = 0,1249 is nearly stable crust material. Ratio of Sm/Nd is low. ena has negative value and very small proved that Ba Na granitoid must derive from crust source or mantle source which rich (EM). The age of source regional forming calculated from isotopic of Sm, Nd is 1.06 Ba (according to model of chondrite mantle source region) or 1.74 Ba (according to model of poor mantle source). The prospects of related mineralization of Ba Na granitoid is Sn (W, Nb, Ta) with amsemblage of topaz - cassiterite - tourmaline - quartz (sometime is Ta - Nb). The result of isotopic analysis of U Pb in zircon of Ba Na biotite granite sample at lab of Tasmania University, Australia, age of Ba Na is 242.9 +1.5 Ma and 240.6 2.2 Ma.

Evidence for a reduced, Fe-depleted martian mantle source region of shergottites

1998 ◽  
Vol 130 (3-4) ◽  
pp. 346-357 ◽  
Author(s):  
Subhabrata Ghosal ◽  
Richard O. Sack ◽  
Mark S. Ghiorso ◽  
Michael E. Lipschutz
Keyword(s):  
Mantle Source ◽  
Source Region ◽  
Mantle Source Region
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