- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Asia
-
Indian Peninsula
-
India
-
Bastar Craton (1)
-
Chhattisgarh India (1)
-
Dharwar Craton (3)
-
Karnataka India (2)
-
Kerala India
-
Trivandrum India (1)
-
-
Madhya Pradesh India
-
Betul India (1)
-
-
Rajasthan India
-
Bikaner India (1)
-
Jhunjhunu India (1)
-
Jodhpur India (1)
-
-
Tamil Nadu India
-
Chennai India (1)
-
-
-
-
-
Atlantic Ocean
-
North Atlantic
-
Vema fracture zone (1)
-
-
-
Indian Ocean
-
Andaman Sea (1)
-
Mid-Indian Ridge
-
Central Indian Ridge (1)
-
-
-
-
commodities
-
metal ores
-
gold ores (2)
-
polymetallic ores (1)
-
-
mineral exploration (2)
-
-
elements, isotopes
-
isotopes
-
radioactive isotopes
-
U-238 (1)
-
-
-
metals
-
actinides
-
uranium
-
U-238 (1)
-
-
-
gold (1)
-
iron (1)
-
platinum group (1)
-
rare earths (4)
-
titanium (1)
-
zirconium (1)
-
-
-
geochronology methods
-
U/Pb (2)
-
-
geologic age
-
Precambrian
-
Archean
-
Mesoarchean (1)
-
Neoarchean (3)
-
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (1)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
anorthosite (1)
-
granites (1)
-
ultramafics
-
peridotites
-
harzburgite (1)
-
-
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (1)
-
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
schists
-
greenstone (1)
-
-
-
-
minerals
-
phosphates
-
monazite (1)
-
-
silicates
-
framework silicates
-
feldspar group
-
plagioclase (1)
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (2)
-
-
-
sorosilicates
-
epidote group
-
epidote (1)
-
-
-
-
-
sulfides (2)
-
-
Primary terms
-
absolute age (2)
-
Asia
-
Indian Peninsula
-
India
-
Bastar Craton (1)
-
Chhattisgarh India (1)
-
Dharwar Craton (3)
-
Karnataka India (2)
-
Kerala India
-
Trivandrum India (1)
-
-
Madhya Pradesh India
-
Betul India (1)
-
-
Rajasthan India
-
Bikaner India (1)
-
Jhunjhunu India (1)
-
Jodhpur India (1)
-
-
Tamil Nadu India
-
Chennai India (1)
-
-
-
-
-
Atlantic Ocean
-
North Atlantic
-
Vema fracture zone (1)
-
-
-
crust (1)
-
crystallography (1)
-
deformation (1)
-
earthquakes (1)
-
faults (2)
-
foliation (1)
-
geochemistry (2)
-
geophysical methods (2)
-
igneous rocks
-
plutonic rocks
-
anorthosite (1)
-
granites (1)
-
ultramafics
-
peridotites
-
harzburgite (1)
-
-
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (1)
-
-
-
-
Indian Ocean
-
Andaman Sea (1)
-
Mid-Indian Ridge
-
Central Indian Ridge (1)
-
-
-
intrusions (2)
-
isotopes
-
radioactive isotopes
-
U-238 (1)
-
-
-
magmas (2)
-
mantle (2)
-
metal ores
-
gold ores (2)
-
polymetallic ores (1)
-
-
metals
-
actinides
-
uranium
-
U-238 (1)
-
-
-
gold (1)
-
iron (1)
-
platinum group (1)
-
rare earths (4)
-
titanium (1)
-
zirconium (1)
-
-
metamorphic rocks
-
schists
-
greenstone (1)
-
-
-
metamorphism (1)
-
mineral exploration (2)
-
ocean floors (1)
-
plate tectonics (1)
-
Precambrian
-
Archean
-
Mesoarchean (1)
-
Neoarchean (3)
-
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (1)
-
-
-
-
tectonics (2)
-
Petrochemistry, Petrogenesis and Geodynamic Implications of Mantle Plume Generated Dhanjori Volcanics, Singhbhum Craton (Eastern India)
Tectono-Thermal History of the Neoarchean Balehonnur Shear Zone, Western Dharwar Craton (Southern India)
Raman-XPS Spectroscopy, REE Chemistry, and Morphological Studies of Detrital Zircon and Monazite – Implications for Metamict State and Provenance
Abstract The Koyna borehole penetrated c. 1 km through the Deccan basalt units and into the cratonic basement beneath, thus providing a unique insight into the subsurface succession of the main Deccan province. Earlier studies focused on southwestern Deccan lava packages exposed in the Western Ghat escarpment, and resolved a well-constrained stratigraphy and key reference sections, but lacked supporting subsurface data. To construct the stratigraphy and correlate it with the main Deccan formations, we report flow-wise physical and chemical data of a c. 932 m-thick core. We document 37 lava-flow units and four lava-flow groups that have similar major-oxide contents. These groups fit into two of the recognized chemostratigraphic formations, and the transitional Poladpur–Ambenali lavas. In addition, data plots on Ba v. Sr; Ba v. Zr/Nb; Ba/Y v. Zr/Nb; and Ba, Sr, Ba/Y, Zr/Nb v. height bivariate diagrams confine them to the Poladpur and Ambenali formations. Lava flows match with the Khumbarli and Mahabaleshwar Ghat sections and Killari core. The granitoid basement–basalt and the Poladpur Formation v. Ambenali Formation contacts lie at −332.5 and c. 482 m above sea-level, respectively. Further, the new data endorse the southern overstepping of chemostratigraphic units and the asymmetry of the Deccan edifice due to the northward motion of the Indian Plate over the nascent Réunion plume ( c. 67–64 Ma). For comparison, the oldest 66.4 Ma lava flow predates the Cretaceous–Paleogene boundary (KPB) (66.052 Ma) by <0.35 Ma, with much of the Wai Subgroup erupted syn-KPB or >0.55 Ma post-KPB; however, the restricted lava thickness at the contact between the Poladpur and Ambenali formations provides a reference point in the Deccan stratigraphy.
Geochemical Studies in India: CSIR-NGRI Contributions
Refertilization of Mantle Peridotites from the Central Indian Ridge: Response to a Geodynamic Transition
Abstract We present field and petrographical characteristics, zircon U–Pb ages, Nd isotopes, and major and trace element data for the magmatic epidote-bearing granitic plutons in the Bellur–Nagamangala–Pandavpura corridor, and address successive reworking and cratonization events in the western Dharwar Craton (WDC). U–Pb zircon ages reveal three stages of plutonism including: (i) sparse 3.2 Ga granodiorite plutons intruding the TTG (tonalite–trondhjemite–granodiorite) basement away from the western boundary of the Nagamangala greenstone belt; (ii) 3.0 Ga monzogranite to quartz monzonite plutons adjoining the Nagamangala greenstone belt; and (iii) 2.6 Ga monzogranite plutons in the Pandavpura region. Elemental data of the 3.2 Ga granodiorite indicate their origin through the melting of mafic protoliths without any significant residual garnet. Moderate to poorly fractionated REE patterns of 3.0 Ga plutons with negative Eu anomalies and Nd isotope data with ε Nd (T) = 3.0 Ga ranging from −1.7 to +0.5 indicate the involvement of a major crustal source with minor mantle input. Melts derived from those two components interacted through mixing and mingling processes. Poorly fractionated REE patterns with negative Eu anomalies of 2.6 Ga plutons suggest plagioclase in residue. The presence of magmatic epidote in all of the plutons points to their rapid emplacement and crystallization at about 5 kbars. The 3.2 Ga intrusions could correspond to reworking associated with a major juvenile crust-forming episode, whilst 3.0 Ga potassic granites correspond to cratonization linked to melting of the deep crust. The 2.6 Ga Pandavpura granite could represent lower-crustal melting and final cratonization, as 2.5 Ga plutons are absent in the WDC.
Abstract The Archean granitoids of the Aravalli Craton (NW India) are represented by orthogneisses (3.3–2.6 Ga) and undeformed granitoids ( c. 2.5 Ga). Here we present whole-rock geochemical (elemental and Nd-isotope) data of the granitoids from the Aravalli Craton with an aim of understanding the evolution of the continental crust during the Archean. These Archean granitoids have been classified into three compositional groups: (1) TTG – tonalite–trondhjemite–granodiorite; (2) t-TTG – transitional TTG; and (3) sanukitoids. Based on the geochemical characteristics, it is proposed that the TTGs have formed from the partial melting of subducting oceanic plateau. The t-TTG formed owing to reworking of an older continental crust (approximately heterogeneous) in response to tectonothermal events in the craton. For the formation of the sanukitoids, a two-stage petrogenetic model is invoked which involves metasomatization of the mantle wedge, followed by slab breakoff and asthenospheric upwelling, which leads to the melting of asthenosphere and the metasomatized mantle wedge. It is also proposed that subducted sediments contributed to the genesis of sanukitoid magma.