scholarly journals Trace element geochemistry and PGE potential of noritic bodies from Uauá block, Bahia - Brazil

1990 ◽  
Vol 13 ◽  
pp. 1-7
Author(s):  
Elson Paiva de Oliveira
Keyword(s):  
Trace Element ◽  
Incompatible Trace Element ◽  
Platinum Group Elements ◽  
Primitive Mantle ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Platinum Group ◽  
Two Bodies ◽  
Field Relationship

Preliminary field relationship and incompatible trace element geochemistry on two bodies of noritic rocks from Uauá area are discussed with the aim of evaluating their metallogenic potential. The rocks show primitive mantle normalized and chondrite normalized patterns very similar to chilled margins and parental magmas to the Bushveld and Insizwa complexes (RSA) which host major platinum group elements deposits. The data suggest the Uauá noritic bodies may be potential for ore mineralisation.

Petrogenesis of a calc-alkaline lamprophyre (minette) from Thanewasna, western Bastar craton, Central India: Insights from mineral, bulk rock and in situ trace element geochemistry

2021 ◽  
pp. SP513-2020-258
Author(s):  
Muduru Lachhana Dora ◽  
Kirtikumar Randive ◽  
Rajkumar Meshram ◽  
Tushar Meshram ◽  
Srinivas Rao Baswani ◽  
...  
Keyword(s):  
Trace Element ◽  
Crustal Contamination ◽  
Central India ◽  
Primitive Mantle ◽  
Trace Element Geochemistry ◽  
Calc Alkaline ◽  
Element Geochemistry ◽  
Bastar Craton ◽  
Supplementary Material

AbstractThe lamproites and kimberlites are well known from the eastern Bastar craton, Central India. However, a Proterozoic lamprophyre dyke is discussed here, from the Western Bastar Craton (WBC). The field geology, petrographic, mineralogical, and whole-rock, and in situ trace element geochemistry of biotite were described for understanding its petrogenesis and lithospheric evolution in the WBC. The Thanewasna lamprophyre (TL) is undeformed and unmetamorphosed, intruded into ca.2.5 Ga charnockite and metagabbro but closely associated with ca. 1.62 Ga undeformed Mul granite. The TL has a characteristic porphyritic texture, dominated by phenocrysts of biotite, microphenocryst of amphibole, clinopyroxene, and a groundmass controlled by feldspar. Mineral chemistry of biotite and amphibole suggest a calc-alkaline (CAL) type, and pyroxene chemistry reveals an orogenic setting. The TL is characterized by high SiO2 and low TiO2, MgO, Ni, and Cr, consistent with its subcontinental lithospheric origin. The presence of crustal xenolith and ocelli texture followed by observed variations in Th/Yb, Hf/Sm, La/Nb, Ta/La, Nb/Yb, Ba/Nb indicate substantial crustal contamination. Whole-rock and in situ biotite analysis by LA-ICPMS show low concentrations of Ni (30-50 ppm) and Cr (70-150 ppm), point to the parental magma evolved nature. Enrichment in H2O, reflected in magmatic mica dominance, combined with high LILE, Th/Yb ratios, and striking negative Nb-Ta anomalies in trace element patterns, is consistent with a source that was metasomatized by hydrous fluids corresponding to those generated by subduction-related processes. Significant Zr-Hf and Ti anomalies in the primitive mantle normalized multi-element plots and the REE pattern of the TL, similar to the global calc-alkaline average trend, including eastern Dharwar craton lamprophyres. Our findings provide substantial petrological and geochemical constraints on petrogenesis and geodynamics. However, the geodynamic trigger that generated CAL magmatism and its role in Cu-Au metallogeny in the WBC, central India, is presently indistinct in the absence of isotopic studies. Nevertheless, the lamprophyre dyke is emplaced close to the Cu-(Au) deposit at Thanewasna.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5361958

REGIONAL TRACE ELEMENT GEOCHEMISTRY OF ZIRCONS IN THE JURASSIC VOLCANIC ARC OF THE SOUTHWEST U.S

2016 ◽  
Author(s):  
Jennifer A. Laughlin ◽  
◽  
Joseph L. Wooden ◽  
A.P. Barth ◽  
John T. Shukle ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Volcanic Arc

PATTERNS OF TRACE ELEMENT GEOCHEMISTRY IN CULTURED NEOGLOBOQUADRINA PACHYDERMA CRUST CALCITE

2020 ◽  
Author(s):  
Caitlin M. Livsey ◽  
◽  
Catherine V. Davis ◽  
Jennifer S. Fehrenbacher ◽  
Claudia Benitez-Nelson ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Neogloboquadrina Pachyderma
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