Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics

Upper Jurassic calcareous nannofossil assemblages have been studied from strata cored over basement blocks now buried under the Iberia Abyssal Plain (Ocean Drilling Program Leg 173 Sites 1065 and 1069). The youngest Jurassic assemblages at each site are Tithonian in age, the same as those at nearby...

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Autores principales: Concheryo, A., Wise S.W., Jr.
Formato: JOUR
Materias:
Jurassic
nannofossil
Ocean Drilling Program
rifting
tectonic setting
Atlantic Ocean
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08845891_v173_n_p1_Concheryo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08845891_v173_n_p1_Concheryo2023-10-03T15:40:36Z Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics Concheryo, A. Wise S.W., Jr. Jurassic nannofossil Ocean Drilling Program rifting tectonic setting Atlantic Ocean Upper Jurassic calcareous nannofossil assemblages have been studied from strata cored over basement blocks now buried under the Iberia Abyssal Plain (Ocean Drilling Program Leg 173 Sites 1065 and 1069). The youngest Jurassic assemblages at each site are Tithonian in age, the same as those at nearby Leg 149 Site 901, an age that predates the breakup of the Iberia continental margin. The paucity of the assemblages, the prevalence of coccospheres, and the relatively high organic contents of the fine clastic sediments in which they occur are characteristic of a restricted interior basin that had little communication with the open ocean. During the major rifting episode (a Berriasian event), the Jurassic sequences were dispersed along with their underlying blocks of presumed continental crust across the ocean-continent transition of the Iberia Abyssal Plain, probably as a result of detachment faulting. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08845891_v173_n_p1_Concheryo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Jurassic
nannofossil
Ocean Drilling Program
rifting
tectonic setting
Atlantic Ocean
spellingShingle Jurassic
nannofossil
Ocean Drilling Program
rifting
tectonic setting
Atlantic Ocean
Concheryo, A.
Wise S.W., Jr.
Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics
topic_facet Jurassic
nannofossil
Ocean Drilling Program
rifting
tectonic setting
Atlantic Ocean
description Upper Jurassic calcareous nannofossil assemblages have been studied from strata cored over basement blocks now buried under the Iberia Abyssal Plain (Ocean Drilling Program Leg 173 Sites 1065 and 1069). The youngest Jurassic assemblages at each site are Tithonian in age, the same as those at nearby Leg 149 Site 901, an age that predates the breakup of the Iberia continental margin. The paucity of the assemblages, the prevalence of coccospheres, and the relatively high organic contents of the fine clastic sediments in which they occur are characteristic of a restricted interior basin that had little communication with the open ocean. During the major rifting episode (a Berriasian event), the Jurassic sequences were dispersed along with their underlying blocks of presumed continental crust across the ocean-continent transition of the Iberia Abyssal Plain, probably as a result of detachment faulting.
format JOUR
author Concheryo, A.
Wise S.W., Jr.
author_facet Concheryo, A.
Wise S.W., Jr.
author_sort Concheryo, A.
title Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics
title_short Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics
title_full Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics
title_fullStr Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics
title_full_unstemmed Jurassic calcareous nannfossils from prefit sediments drilled during ODP Leg 173, Iberia Abyssal plain, and their implications for rift tectonics
title_sort jurassic calcareous nannfossils from prefit sediments drilled during odp leg 173, iberia abyssal plain, and their implications for rift tectonics
url http://hdl.handle.net/20.500.12110/paper_08845891_v173_n_p1_Concheryo
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AT wiseswjr jurassiccalcareousnannfossilsfromprefitsedimentsdrilledduringodpleg173iberiaabyssalplainandtheirimplicationsforrifttectonics
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