Petrology and Provenance of Neogene Sand from Nicobar and Bengal Fans, DSDP Sites 211 and 218

Ingersoll, Raymond V.; Suczek, Christopher A.

doi:10.1306/212f78f1-2b24-11d7-8648000102c1865d

Cited by 96 publications

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“…The framework parameters of detrital modes, as listed in Table 1 were employed. (Ingersoll & Suczek, 1979 Sandstone classifications and pebble size analysis were done using QFL plots of Pettijohn, Potter, and Siever (1987). The coefficient of variation in pebble size was computed as C= s/π.…”

Section: Methodsmentioning

confidence: 99%

Petrographic Study of Some Paleoproterozoic Sedimentary Rocks in the Chagupana and Tarkwa Areas of Ghana

Brako

Foli

Amedjoe

et al. 2020

International Journal of Geography and Geology

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Article HistoryKeywords Conglomerate Sandstone Greywacke Indurated Immature Tarkwaian.This study geologically compares conglomerate and sandstone units in the Chagupana area of the Upper West Region and the Kawere conglomerate and Kawere-Huni-Banket sandstone units in the Tarkwa area of the Western Region in Ghana. Some work in the area has over time proposed that rocks from the two areas as similar based on only field relations, hence the need for more detailed work for re-classification. Macro and microscopic studies of the composition, mineralogy and texture of the rock types reveal that the conglomerates in both areas are metamorphic-clast units, greenish-grey, polymictic, foliated and texturally immature. Compositionally and mineralogically, Chagupana conglomerate is matrix-supported and immature, while Kawere conglomerate is clast-supported and mature; these constraint similarities between the conglomerates to only composition. The sandstones from both areas have similar mineralogical compositions, but with decreasing feldspar in the order of Chagupana>Huni>Kawere>Banket. Texturally, all the sandstones are sub-mature, well-indurated and angular-rounded; except the Huni sandstone, which is fine to medium-grained, while the other sandstones are medium-coarse-grained. Based on the feldspar contents, the Chagupana, Huni, Banket and Kawere sandstones classify as greywacke, feldspathic arenite, sub-litharenite and sub-feldspathic-feldspathic arenite, respectively. The greywacke and sandstones have the same cementing materials as quartz, sericite and chlorite. Concluding, the Chagupana rocks are not entirely the same as those from the Tarkwaian Group, probably due to differences in provenance.

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Section: Methodsmentioning

confidence: 99%

Petrographic Study of Some Paleoproterozoic Sedimentary Rocks in the Chagupana and Tarkwa Areas of Ghana

Brako

Foli

Amedjoe

et al. 2020

International Journal of Geography and Geology

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show abstract

“…The framework parameters of detrital modes, as listed in Table 1 were employed. (Ingersoll & Suczek, 1979).…”

Section: Methodsmentioning

confidence: 99%

Untitled

2020

International Journal of Geography and Geology

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This study geologically compares conglomerate and sandstone units in the Chagupana area of the Upper West Region and the Kawere conglomerate and Kawere-Huni-Banket sandstone units in the Tarkwa area of the Western Region in Ghana. Some work in the area has over time proposed that rocks from the two areas as similar based on only field relations, hence the need for more detailed work for re-classification. Macro and microscopic studies of the composition, mineralogy and texture of the rock types reveal that the conglomerates in both areas are metamorphic-clast units, greenish-grey, polymictic, foliated and texturally immature. Compositionally and mineralogically, Chagupana conglomerate is matrix-supported and immature, while Kawere conglomerate is clast-supported and mature; these constraint similarities between the conglomerates to only composition. The sandstones from both areas have similar mineralogical compositions, but with decreasing feldspar in the order of Chagupana>Huni>Kawere>Banket. Texturally, all the sandstones are sub-mature, well-indurated and angular-rounded; except the Huni sandstone, which is fine to medium-grained, while the other sandstones are medium-coarse-grained. Based on the feldspar contents, the Chagupana, Huni, Banket and Kawere sandstones classify as greywacke, feldspathic arenite, sub-litharenite and sub-feldspathic-feldspathic arenite, respectively. The greywacke and sandstones have the same cementing materials as quartz, sericite and chlorite. Concluding, the Chagupana rocks are not entirely the same as those from the Tarkwaian Group, probably due to differences in provenance. Contribution/Originality: This study uses petrographic and structural investigations to unravel the puzzle of the Paleoproterozoic sedimentary rocks in the Chagupana area of the Upper West Region as being part, or not, of the Tarkwaian Group in the Tarkwa area of Ghana. 1. BACKGROUND The western half of Ghana is underlain by Paleoproterozoic Birimain rocks. The Birimian rocks consist of metavolcanic belts and metasedimentary basins that are intruded by granitoids. Overlying the Birimian metavolcanics are some Paleoproterozoic sedimentary rocks that formed the Tarkwaian Group (Leube, Hirdes, Mauer, & Kesse, 1990). In a way-up stratigraphic order, the Tarkwain group consists of sequence of Kawere conglomerate and sandstones, Banket conglomerate and sandstones, Tarkwa phyllite and Huni sandstone in the

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“…The petrographic aspect of the studied sandstones was identi ed through the determination of mineralogical composition, textural and microstructure characteristics under the optical polarizing microscope. In the present study, the studied sandstone samples were classi ed mineralogically according to Folk (1974) and classi ed tectonically according to the tectonic discrimination elds described by Ingersoll and Suczek (1979).…”

Section: Petrographic Characteristics Classi Cation and Provenance Of Studied Sandstonesmentioning

confidence: 99%

Evaluation of geotechnical properties, petrographic characteristics and ultrasonic wave velocity of weak sandstones

Ogila

Aal

Bakey

2021

Preprint

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Several new settlements have been constructed in the desert areas of Egypt. These new settlements are composed of many new types of problematic formations that creating many geological and engineering challenges. One of the most problematic formations is weak sandstones that are characterized by low mechanical strength and bearing capacity as well as high deformability and fracturing. The physico-mechanical characteristics of these sandstones are the most crucial parameters in design and stability evaluation of any surface and underground engineering structures. The determination of these parameters is complicated, difficult and time consuming as well as is required a great accuracy in sample preparation and testing procedure, and is considered as expensive testing. The objective of this study is analyzing the shallow marine weak sandstones to determine the best and significant correlations of petrographic characteristics and physical engineering index properties that may be useful for estimating unconfined compressive strength (UCS), uniaxial pore volume compressibility (mv), compressional P-wave velocity (Vp) and dynamic constrained modulus (Es). As well as predicting the UCS and mv from compressional P-wave velocity test and estimating the petrographic parameters from the physical engineering index parameters. The present study revealed that the studied samples are high to very high porous sandstones with very low to moderate density, and classified as extremely weak to weak rocks with very high deformability and very low wave velocity. In this study, the physical properties form non-significant linear relations with UCS, Vp, and Es as well as there are moderately strong to strong correlations between P-wave velocity, constrained modulus, unconfined compressive strength and compressibility characteristics. Based on the regression analysis, the dolomite cement and matrix contents, quartz and rock fragments contents, packing density and proximity, sorting, roundness, mean grain size, and grain to cement contact exhibited weak to strong statistical correlations with mechanical properties of the studied sandstones. These relationships revealed that due to the mineralogical, textural, and microstructure variations of the studied recycle origin sandstones, the non-significant to significant relations are resulted. In this study, the backward multiple regression was applied to predict the UCS, mv, Vp and Es of the studied sandstones by selecting some physical and petrographic characteristics which exhibit statistically significant correlations with them. The results of this study were presented in the form of predictive models and equations.

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Petrology and Provenance of Neogene Sand from Nicobar and Bengal Fans, DSDP Sites 211 and 218

Cited by 96 publications

References 0 publications

Petrographic Study of Some Paleoproterozoic Sedimentary Rocks in the Chagupana and Tarkwa Areas of Ghana

Petrographic Study of Some Paleoproterozoic Sedimentary Rocks in the Chagupana and Tarkwa Areas of Ghana

Untitled

Evaluation of geotechnical properties, petrographic characteristics and ultrasonic wave velocity of weak sandstones

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