The Cumbres Calchaquíes Range (NW-Argentina). Geochemical sedimentary provenance, tectonic setting and metamorphic evolution of a Neoproterozoic sedimentary basin

2019 ◽  
Vol 93 ◽  
pp. 480-494 ◽  
Author(s):  
José P. López ◽  
Uwe Altenberger ◽  
Laura I. Bellos ◽  
Christina Günter
Keyword(s):  
Sedimentary Basin ◽  
Tectonic Setting ◽  
Metamorphic Evolution ◽  
Sedimentary Provenance

scholarly journals Permian Triassic geologic evolution in the southern Kitakami Belt, Japan

1992 ◽  
Vol 6 ◽  
pp. 155-155
Author(s):  
Kotaro Kamada
Keyword(s):  
Middle Triassic ◽  
Sedimentary Basin ◽  
Tectonic Setting ◽  
Japan Sea ◽  
Passive Margin ◽  
Middle Permian ◽  
Asian Continent ◽  
Transform Faults ◽  
Magmatic Arc ◽  
The Japan Sea

Before opening of the Japan Sea, the Japanese islands were attached to the eastern margin of the Asian continent. The Southern Kitakami Belt is regarded as a micro-continent in an accretional complex of the islands, that accreted before the Early Cretaceous. But its tectonic setting and location between the belt and the Asian continent is still an unresolved argument.Permo-Triassic sequences in the Southern Kitakami Belt are composed of shallow to off-shore deposits. These deposits are composed of clastics, carbonates with volcaniclastics. But there was no volcanic activity in the belt in the Middle to Late Permian. From the viewpoint of the sedimentary character and history, the Middle Permian to Middle Triassic sequences differ from their previous and their following successions in the belt. And the sedimentary basin of Middle Permian to Middle Triassic was bounded by transform faults. Magmatic arc was replaced by passive margin as hinterland of the Southern Kitakami Belt during the Middle Permian to Middle Triassic. It means that the sedimentary basin moved from the margin of Yangtze Platform to Sino-Korean Platform at that time.

Late Neoproterozoic to early Paleozoic paleogeographic position of the Yangtze block and the change of tectonic setting in its northwestern margin: Evidence from detrital zircon U-Pb ages and Hf isotopes of sedimentary rocks

2021 ◽  
Author(s):  
Bingshuang Zhao ◽  
Xiaoping Long ◽  
Jin Luo ◽  
Yunpeng Dong ◽  
Caiyun Lan ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Tectonic Setting ◽  
Sedimentary Rocks ◽  
Detrital Zircons ◽  
Hf Isotopes ◽  
Early Paleozoic ◽  
Yangtze Block ◽  
Sedimentary Provenance ◽  
Northwestern Margin ◽  
Late Neoproterozoic

The crustal evolution of the Yangtze block and its tectonic affinity to other continents of Rodinia and subsequent Gondwana have not been well constrained. Here, we present new U-Pb ages and Hf isotopes of detrital zircons from the late Neoproterozoic to early Paleozoic sedimentary rocks in the northwestern margin of the Yangtze block to provide critical constraints on their provenance and tectonic settings. The detrital zircons of two late Neoproterozoic samples have a small range of ages (0.87−0.67 Ga) with a dominant age peak at 0.73 Ga, which were likely derived from the Hannan-Micangshan arc in the northwestern margin of the Yangtze block. In addition, the cumulative distribution curves from the difference between the depositional age and the crystalline age (CA−DA) together with the mostly positive εHf(t) values of these zircon crystals (−6.8 to +10.7, ∼90% zircon grains with εHf[t] > 0) suggest these samples were deposited in a convergent setting during the late Neoproterozoic. In contrast, the Cambrian−Silurian sediments share a similar detrital zircon age spectrum that is dominated by Grenvillian ages (1.11−0.72 Ga), with minor late Paleoproterozoic (ca. 2.31−1.71 Ga), Mesoarchean to Neoarchean (3.16−2.69 Ga), and latest Archean to early Paleoproterozoic (2.57−2.38 Ga) populations, suggesting a significant change in the sedimentary provenance and tectonic setting from a convergent setting after the breakup of Rodinia to an extensional setting during the assembly of Gondwana. However, the presence of abundant Grenvillian and Neoarchean ages, along with their moderately to highly rounded shapes, indicates a possible sedimentary provenance from exotic continental terrane(s). Considering the potential source areas around the Yangtze block when it was a part of Rodinia or Gondwana, we suggest that the source of these early Paleozoic sediments had typical Gondwana affinities, such as the Himalaya, north India, and Tarim, which is also supported by their stratigraphic similarity, newly published paleomagnetic data, and tectono-thermal events in the northern fragments of Gondwana. This implies that after prolonged subduction in the Neoproterozoic, the northwestern margin of the Yangtze block began to be incorporated into the assembly of Gondwana and then accept sediments from the northern margin of Gondwanaland in a passive continental margin setting.

scholarly journals Geochemical Analysis of Sediments from Sahaiawei-1 Well of the Northern Delta Depobelt in the Niger Delta Basin, Nigeria

2021 ◽  
Vol 13 (1) ◽  
pp. 125-135
Author(s):  
K. Itiowe ◽  
F. A. Lucas ◽  
E. O. Avwenagha
Keyword(s):  
Niger Delta ◽  
Depositional Environment ◽  
Tectonic Setting ◽  
Fluorescence Analysis ◽  
Hydrocarbon Exploration ◽  
Geochemical Analysis ◽  
X Ray ◽  
Sedimentary Provenance ◽  
Niger Delta Basin

Geochemical analysis of sediments from Sahaiawei-1 Well of the Northern Delta Depobelt in the Niger Delta Basin was carried out to classify the sediments, determine the provenance, tectonic setting and depositional environment. Twenty (20) ditch cutting samples between 1500 and 10730 ft. were subjected to X-ray fluorescence analysis to determine the elemental composition.  The result for the classification of the sediments shows that the sediments were classified as Fe-shale and Fe-sand. The discriminant function diagrams for provenance signature and tectonic setting show that the sediments were plotted within the quartzose sedimentary provenance and passive continental margin tectonic setting fields respectively. The depositional environment using inorganic geochemistry shows that the sediments were deposited with in the continental, transitional and marine environments. This research has provided up to date information on the geochemistry of the Northern Delta Depobelt which would help in hydrocarbon exploration in the area.

scholarly journals PETROGRAPHY AND GEOCHEMISTRY OF METASEDIMENTARY ROCKS FROM THE TAKU SCHIST IN KELANTAN, NORTH-EAST PENINSULAR MALAYSIA.

2021 ◽  
Vol 5 (2) ◽  
pp. 124
Author(s):  
Muhammad Irman Khalif Bin Ahmad Aminuddin ◽  
Nugroho Imam Setiawan ◽  
I Wayan Warmada ◽  
Kamar Shah Ariffin ◽  
Kotaro Yonezu
Keyword(s):  
Sedimentary Cover ◽  
Tectonic Setting ◽  
Evolutionary Process ◽  
Peninsular Malaysia ◽  
Amphibolite Facies ◽  
Accretionary Wedge ◽  
Metasedimentary Rocks ◽  
North East ◽  
The North ◽  
Sedimentary Provenance

The Taku Schist, which is located in the north-east Peninsular Malaysia, is characterized by its North-South oriented elongated body. It forms part of the Indonesian orogenic build-up that was generated via the convergence of the Sibumasu continental unit and Sukhothai Arc. Subsequent petrography analyses of the metasedimentary rocks sourced from the Taku Schist revealed that their formation was attributable to the metamorphism of greenschist into amphibolite facies, which could be observed near the Triassic and Cretaceous intrusions of the Kemahang Granite. The evolutionary process of the rocks could be linked with the interactions occurring between contact and regional metamorphisms. The resulting chemical classification upon their assessment disclosed that the metasedimentary rocks of Taku Schist were made up of greywacke and shale, grouped into the quartzose sedimentary provenance, and belonged to the Continental Island Arc (CIA). This information is required for the tectonic setting discrimination purpose. It is a reflection of the episodic contractions underwent by the Taku Schist, wherein they would lead to the Sibumasu sedimentary cover along with both an accretionary wedge and the genetically-correlated Bentong-Raub melange to different greenschist. Otherwise associated with amphibolite facies, the conditions and depths of the facies were determined according to their position in relation to the upper plate of the Sukhothai Arc.

Oxygen isotope systematics of the Precambrian basement of Alberta: implications for Paleoproterozoic and Phanerozoic tectonics in northwestern Alberta

2000 ◽  
Vol 37 (11) ◽  
pp. 1611-1628 ◽  
Author(s):  
Ronald A Burwash ◽  
Thomas Chacko ◽  
Karlis Muehlenbachs ◽  
Youcef Bouzidi
Keyword(s):  
Oxygen Isotope ◽  
Sedimentary Basin ◽  
Tectonic Setting ◽  
Precambrian Basement ◽  
Regional Survey ◽  
Rock Interaction ◽  
Basement Faults ◽  
Basement Structures ◽  
Temperature Interaction ◽  
Seismic Reflection Profiles

We have conducted a regional survey of the oxygen isotope compositions of drill core samples from the Precambrian basement of the Alberta sedimentary basin. The majority of samples have whole-rock δ18O (SMOW) values between +7 and +11‰, as is typical of crustal rocks. However, there are also a significant number of samples with δ18O values less than +5‰. In these samples, high-grade minerals such as pyroxene, amphibole, and biotite commonly show retrograde alteration to chlorite and (or) epidote. The majority of low-δ18O samples are from a 250 x 50 km zone in northwestern Alberta, which we refer to as the Kimiwan isotope anomaly. The anomaly is significant in that the most reasonable explanation for generating such a laterally extensive zone of rocks, with δ18O values below +5‰, is through high-temperature interaction with surface-derived fluids in an extensional tectonic setting. We propose, therefore, that the low-δ18O samples define a hitherto unrecognized extensional zone in the Alberta basement. Available geochronological data indicate that fluid-rock interaction and associated 18O depletion occurred at ca. 1800 Ma. Oxygen and hydrogen isotope data on mineral separates from this zone indicate that the surface fluids responsible for 18O depletion were of meteoric origin. Seismic reflection profiles acquired during the Lithoprobe Alberta Basement Transect reveal the presence of basement faults spatially associated with the zone of 18O depletion. We propose that these faults were extensional in nature at ca. 1800 Ma. Periodic reactivation of these basement structures during the Phanerozoic played an important role in the development of faults in the overlying sedimentary basin.

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