Paleozoic and Mesozoic stratigraphy of the Peshawar basin, Pakistan: Correlations and implicationsстатья из журнала
Аннотация: Research Article| August 01, 1992 Paleozoic and Mesozoic stratigraphy of the Peshawar basin, Pakistan: Correlations and implications KEVIN R. POGUE; KEVIN R. POGUE 1Department of Geosciences, Oregon State University, Corvallis, Oregon 97331-5506 Search for other works by this author on: GSW Google Scholar BRUCE R. WARDLAW; BRUCE R. WARDLAW 2U.S. Geological Survey, M.S. 970, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar ANITA G. HARRIS; ANITA G. HARRIS 2U.S. Geological Survey, M.S. 970, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar AHMAD HUSSAIN AHMAD HUSSAIN 3Geological Survey of Pakistan, 86-C New Defense Officer's Colony, Shami Road, Peshawar, Pakistan Search for other works by this author on: GSW Google Scholar GSA Bulletin (1992) 104 (8): 915–927. https://doi.org/10.1130/0016-7606(1992)104<0915:PAMSOT>2.3.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation KEVIN R. POGUE, BRUCE R. WARDLAW, ANITA G. HARRIS, AHMAD HUSSAIN; Paleozoic and Mesozoic stratigraphy of the Peshawar basin, Pakistan: Correlations and implications. GSA Bulletin 1992;; 104 (8): 915–927. doi: https://doi.org/10.1130/0016-7606(1992)104<0915:PAMSOT>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The most complete Paleozoic sequence described from Pakistan is exposed in bedrock inliers and in ranges fringing the eastern Peshawar basin. Interbedded quartzite and argillite of the Precambrian and Cambrian Tanawal Formation is overlain unconformably by the Cambrian(?) Ambar Formation. The Misri Banda Quartzite unconformably overlies the Ambar and contains Ordovician Cruziana ichnofossils. New conodont discoveries restrict the ages of overlying formations as follows: Panjpir Formation, Llandoverian to Pridolian; Nowshera Formation, Lochkovian to Frasnian; and Jafar Kandao Formation, Kinderhookian to Westphalian. The Karapa Greenschist, consisting of metamorphosed lava flows, separates the Jafar Kandao from Upper Triassic (Carnian) marbles of the Kashala Formation. The Upper Triassic and Jurassic(?) Nikanai Ghar Formation forms the top of the section.Correlatives to the Peshawar basin stratigraphy are present locally in the Sherwan synclinorium of Hazara and in the Khyber Pass region. The sequence contrasts markedly with the Paleozoic and Mesozoic section exposed south of the Khairabad thrust in the Attock-Cherat Range. This thrust and its northeastern continuation in Hazara north of Abbottabad thus form the boundary in Pakistan between the Lesser Himalayan and Tethyan Himalayan sections, a function performed by the Main Central thrust (MCT) in the central Himalaya of India and Nepal.The newly dated Carboniferous to Triassic horizons provide the first firm age constraints on the protoliths of the high-grade Swat metasediments. The dating of the metasediments has, in turn, provided age constraints on pre-Himalayan tectonism and associated intrusions. Two major tectonic episodes during the Late(?) Cambrian and Carboniferous produced positive areas north of the Peshawar basin that provided coarse detritus to the Misri Banda Quartzite and Jafar Kandao Formation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 1992
Издательство: Geological Society of America
Источник: Geological Society of America Bulletin
Ключевые слова: Evolution and Paleontology Studies, Geological formations and processes, Geological and Geochemical Analysis
Открытый доступ: closed
Том: 104
Выпуск: 8
Страницы: 915–927