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Geography

Neoglacial (<3000 years) till and flutes at Saskatchewan Glacier, Canadian Rocky Mountains, formed by subglacial deformation of a soft bed
submitted by hagh 44 minutes ago - Topic: Geography
Understanding the processes that deposit till below modern glaciers provides fundamental information for interpreting ancient subglacial deposits. A process-deposit-landform model is developed for the till bed of Saskatchewan Glacier in the Canadian Rocky Mountains. The glacier is predominantly hard-bedded in its upper reaches which flows through a deep valley carved into resistant Palaeozoic c...



Diagenetic evolution of Aptian evaporites in the Namibe Basin (south-west Angola)
submitted by hagh 44 minutes ago - Topic: Geography
The widespread and dissected nature of the Angolan gypsiferous salt residuals offers a uniquely detailed view of the lateral and vertical relations inherent to secondary evaporite textures, which typify exhumed salt masses worldwide. Such secondary textures are sometimes misinterpreted as primary evaporite textures. Thin, metre-scale and patchy, dome-like gypsum accumulations are well-exposed w...

Biogeography of the Anthropocene: Novel species assemblages
submitted by tokeyoaden 46 minutes ago - Topic: Geography
Humans have altered the land cover and biogeochemical cycles of Earth, with many implications for how the study of the distributions of organisms should change. A new biogeography of the Anthropocene could help to develop additional criteria to evaluate the degree and timing of human impacts, and innovative ways to proactively manage biological diversity. Many recent studies have used paleoecol...

Microbial mat records in siliciclastic rocks: Examples from Four Indian Proterozoic basins and their modern equivalents in Gulf of Cambay
submitted by hononnsaar 1 hour ago - Topic: Geography
Microbial mat-related structures (MRS) in siliciclastics have been investigated from four Proterozic formations in India, namely the Marwar Supergroup, the Vindhyan Supergroup, the Chhatisgarh Supergroup and the Khariar Group for their spectral variations, genetic aspects, palaeo–environmental significance and influence on sequence stratigraphic architecture. The maximum diversification of MR...

Paleomagnetic analysis of the Marwar Supergroup, Rajasthan, India and proposed interbasinal correlations
submitted by hononnsaar 1 hour ago - Topic: Geography
The Marwar Supergroup refers to a 1000–2000m thick marine and coastal sequence that covers a vast area of Rajasthan in NW–India. The Marwar Basin uncomformably overlies the ∼750–770Ma rocks of the Malani Igneous Suite and is therefore considered Late Neoproterozoic to Early Cambrian in age. Upper Vindhyan basinal sediments (Bhander and Rewa Groups), exposed in the east and separated by ...



Organic geochemistry of the Vindhyan sediments: Implications for hydrocarbons
submitted by hononnsaar 1 hour ago - Topic: Geography
The organic geochemical methods of hydrocarbon prospecting involve the characterization of sedimentary organic matter in terms of its abundance, source and thermal maturity, which are essential prerequisites for a hydrocarbon source rock. In the present study, evaluation of organic matter in the outcrop shale samples from the Semri and Kaimur Groups of Vindhyan basin was carried out using Rock ...

Anomalous crustal and lithospheric mantle structure of southern part of the Vindhyan Basin and its geodynamic implications
submitted by hononnsaar 1 hour ago - Topic: Geography
Tectonically active Vindhyan intracratonic basin situated in central India, forms one of the largest Proterozoic sedimentary basins of the world. Possibility of hydrocarbon occurrences in thick sediments of the southern part of this basin, has led to surge in geological and geophysical investigations by various agencies. An attempt to synthesize such multiparametric data in an integrated manner...


Depositional character of a dry-climate alluvial fan system from Palaeoproterozoic rift setting using facies architecture and palaeohydraulics: Example from the Par Formation, Gwalior Group, central India
submitted by hononnsaar 1 hour ago - Topic: Geography
The ∼20m thick coarse-grained clastic succession in the basal part of Palaeoproterozoic Par Formation, Gwalior Group has been investigated using process-based sedimentology and deductive palaeohydraulics. Bounded between granitic basement at its base and shallow marine succession at the top, the studied stratigraphic interval represents products of an alluvial fan and its strike-wise co-exist...

Were the hydraulic parameters of Precambrian rivers different?
submitted by hononnsaar 1 hour ago - Topic: Geography
Palaeohydraulic estimates have been made using time-tested standard empirical formula involving channel dimensions, especially channel depth, in four Indian Proterozoic fluvial formations. These are the Mesoproterozoic Ramdurg, younger Mesoproterozoic Muchkundi and Neoproterozoic Cave Temple Arenite in Karnataka, and Upper Rewa Sandstone in central India. The basic data came from direct measure...


Role of hydrothermal activity in uranium mineralisation in Palnad Sub-basin, Cuddapah Basin, India
submitted by hononnsaar 1 hour ago - Topic: Geography
Unconformity related uranium mineralisation occurs in Banganapalle Formation of Palnad Sub-basin, Cuddapah Basin. Several evidences of hydrothermal activity exist in both basement granite and the cover sediments in Koppunuru and Rallavagu Tanda (R. V. Tanda) uranium prospects of Palnad Sub-basin. Profuse development of fracture filled veins consisting of epidote–quartz, chlorite–quartz and ...

Carbonate platform development in a Paleoproterozoic extensional basin, Vempalle Formation, Cuddapah Basin, India
submitted by hononnsaar 1 hour ago - Topic: Geography
Sedimentological investigation of the late Paleoproterozoic (Orosirian) Vempalle Formation of the Cuddapah Basin, Dharwar craton, India, reveals three facies association that range from supratidal to deep subtidal. Sedimentary rocks of this succession are dominated by heterolithic carbonate mudstone, intraformational carbonate conglomerate, and a variety of columnar, domal, and stratiform micro...


Contributions of zircon U–Pb geochronology to understanding the volcanic and sedimentary history of some Purāna basins, India
submitted by hononnsaar 1 hour ago - Topic: Geography
In this century, U–Pb ages of magmatic and detrital zircons, together with a few less accurate but fairly robust ages determined on monazite and baddeleyite, in the Purāna successions in India have established a few firm timelines that constrain the opening, closure, inversion, and provenance of the Purāna basins. The Cuddapah basin opened shortly before ca. 1900Ma, the Vindhyan basin opene...

Proterozoic evolution of Eastern Dharwar and Bastar cratons, India – An overview of the intracratonic basins, craton margins and mobile belts
submitted by hononnsaar 1 hour ago - Topic: Geography
Based on critical analysis of stratigraphic succesions in the Proterozoic intracratonic basins, geochronological data and possible connections or disconnections with adjacent fold belts and craton margin mobile belts, an overview of the Proterozoic evolution of the Eastern Dharwar and Bastar cratons in India is presented. The Chattisgarh and Cuddapah basins in these cratons with Archean nuclei ...

Zircon U–Pb ages, Hf isotopes and geochemistry of the schists, gneisses and granites in Delbar Metamorphic-Igneous Complex, SE of Shahrood (Iran): Implications for Neoproterozoic geodynamic evolutions of Central Iran
submitted by hononnsaar 1 hour ago - Topic: Geography
The Delbar Metamorphic-Igneous Complex (DMIC) consists of the medium to high-grade metamorphic rocks and granites – leucogranites is located in the Biarjmand region, in Central Iran. U–Pb dating of the gneisses yielded the ages of 546±3.7–547±6.8Ma similar to the crystallization ages of leucogranites (541±4.7–547±11Ma) are consistent to the Late Ediacaran–Early Cambrian ages of Ca...

Palaeozoic polymetamorphism in the North Qinling orogenic belt, Central China: Insights from petrology and in situ titanite and zircon U–Pb geochronology
submitted by hononnsaar 1 hour ago - Topic: Geography
The Qinling orogenic belt experienced multiple phases of orogenesis during the Palaeozoic. Unraveling the timing and P–T conditions of these events is the key to understanding the convergence processes between the South China and the North China Blocks. The Songshugou Complex, located in the southern part of the North Qinling orogenic belt, has registered multistage metamorphism in Palaeozoic...