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5. the Sedimentary Record of the Alboran Basin: an Attempt at Sedimentary Sequence Correlation and Subsidence Analysis1

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5. the Sedimentary Record of the Alboran Basin: an Attempt at Sedimentary Sequence Correlation and Subsidence Analysis1 Zahn, R., Comas, M.C., and Klaus, A. (Eds.), 1999 Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 161 5. THE SEDIMENTARY RECORD OF THE ALBORAN BASIN: AN ATTEMPT AT SEDIMENTARY SEQUENCE CORRELATION AND SUBSIDENCE ANALYSIS1 José Rodríguez-Fernández,2 María C. Comas,2 Jesús Soría,3 José A. Martín-Pérez,4 and Juan I. Soto2 ABSTRACT Neogene marine sediments in the Betic Neogene Basins of the Alboran Domain (Betic Cordillera) have their counterparts in the Alboran Sea basin. Lower Miocene to Pliocene deposits in the Alboran Sea basin (studied from seismic data, commercial wells, and Ocean Drilling Program Leg 161) and coeval sedimentary sequences in the Betic Neogene Basins cropping out on land were correlated on the basis of biostratigraphic criteria. Major unconformities representing common events in basin evolu- tion were distinguished offshore and onshore. Two important hiatuses, in the lower Tortonian (calcareous nannofossil zone NN9) and in the lower Pliocene (zone NN13 and parts of zones NN12 and NN14), recognized throughout the domain, corre- spond with basin-wide events. Calcareous nannofossils from cuttings from the commercial well Andalucía-A1 were used to derive a new age estimate for sediments in the Alboran Basin. Backstripping analysis, performed at Site 976 (Western Alboran Basin) and at two commercial wells, Andalucía-A1 (Eastern Alboran Basin) and Granada-D1 (onshore), reveals two periods of subsidence, one in the middle Miocene (15.5−14.5, 13−10.7 Ma) and the other in the late Pliocene–Pleistocene (2.5−0 Ma), which can be correlated with rifting episodes in the tectonic evolution of the basin. This analysis also shows a rapid uplift at the Tortonian/Messinian boundary that can be correlated with partial emergences of the Alboran Domain. INTRODUCTION 6° W 5° 4° 3° 2° IBERIAN The Alboran Basin, in the westernmost Mediterranean, is bound- FORELAND Alboran Granada ed to the north by the Betic Cordillera (southern Spain) and to the N Betic Cordillera SPAIN Sea ° south by the Rif and Tell Mountains, which are connected through the 37 Atlantic Tell Ocean GR-D1 Almería Gibraltar Arc (Fig. 1). The Internal Zones of the Betic Cordillera con- Rif tain numerous intramontane depressions and corridors filled with Málaga Alb-A1 And-A1 CHB Miocene–Pleistocene sedimentary sequences (Fig. 2). These depres- 200 sions, commonly known as Betic Neogene Basins, were analyzed G1 from several viewpoints, including sedimentary, tectonics, magma- Gibraltar Site 976 Site 978 1000 DB tism, and geophysics, although their origin and evolution remain a DSDP 121 EAB 36° Site 977 subject of much debate (e.g., Montenat et al., 1992; Sanz de Galdeano ACH AI and Vera, 1992; Rodríguez-Fernández and Sanz de Galdeano, 1992). Tangier WAB 1000 The Betic Neogene Basins include marine to continental sedimentary AR Site 979 SAB sequences from early Miocene to Holocene age, accompanied by Tétouan XB Melilla local alkali to calc-alkali magmatism from the middle Miocene to 200 MOROCCO EJ Pliocene (Hernandez et al., 1987). The sedimentary sequences of the Al-Hoseima Betic Neogene Basins vary in character, with highly variable facies 35° distribution and thickness largely controlled by tectonic processes. Figure 1. Bathymetric map of the Alboran Sea showing Leg 161 sites, Deep Pleistocene to middle Miocene sediments from the Alboran Sea Sea Drilling Project (DSDP) Site 121, and commercial boreholes offshore basin (Fig. 2) were drilled at Site 976 during Ocean Drilling Program (G1, Alb-A1, And-A1, EJ, and GR-D1). The insert map shows the location Leg 161 (Comas, Zahn, Klaus, et al., 1996). In addition, the entire of the Alboran Sea between the Betic and Rif Cordilleras. ACH = Alboran sedimentary sequence beneath the northern shelf of the Alboran Sea Channel, Al = Alboran Island, AR = Alboran Ridge, CHB = Chella Bank, basin is also known from commercial borehole data. Results from DB = Djibouti Bank, EAB = Eastern Alboran Basin, SAB = Southern Albo- both commercial and scientific drilling indicate that sedimentary ran Basin, and WAB = Western Alboran Basin, and XB = Xauen Bank. Con- sequences from the Alboran Sea basin have counterparts in marine tour lines every 200 m. deposits cropping out in the Betic Neogene Basins. The existence of these outcrops proves that during the Miocene the marine Alboran Basin occupied a broader area, extending beyond the present limits of The aim of this paper is to correlate the sedimentary sequences of the Alboran Sea basin (Comas et al., 1992; Jurado and Comas, 1992). the Alboran Sea basin with coeval sediments cropping out in the Bet- ic Neogene Basins. Previous age estimates from commercial bore- hole data were calibrated and occasionally modified on the basis of examination of calcareous nannofossils in cutting samples from well 1Zahn, R., Comas, M.C., and Klaus, A. (Eds.), 1999. Proc. ODP, Sci. Results, 161: Andalucía-A1. The nannofossil scales of Martini (1971) and Okada College Station, TX (Ocean Drilling Program). and Bukry (1980) were used for age determinations in both onshore 2Instituto Andaluz de Ciencias de la Tierra, CSIC and University of Granada, 18002 sediments and rocks recovered from well Andalucía-A1. At Hole Granada, Spain. Rodríguez-Fernández: [email protected] 976B, the calcareous nannofossil biozonation employed by Leg 161 3Departamento de Ciencias de la Tierra y Medio Ambiente, University of Alicante, Alicante, Spain. is implemented (Comas, Zahn, Klaus, et al., 1996). 4Departamento de Estratigrafía y Paleontología, University of Granada,18002 Gran- Backstripping was performed for Hole 976B and two commercial ada, Spain. wells, Andalucía-A1 (Northeastern Alboran Basin) and Granada-D1 69 J. RODRÍGUEZ-FERNÁNDEZ ET AL. @@PPÀÀ @@@@@PPPPPÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀ@@@PPPÀÀÀ @@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ 1. Lower Burdigalian sequence. This sequence is up to 80 m thick @@PPÀÀ @@@@@PPPPPÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀ@@@PPPÀÀÀ GX @@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ and lies unconformably upon the Alpujárride and Maláguide meta- @@PPÀÀ @@@@@PPPPPÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀ@@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ @@PPÀÀ @@@@@PPPPPÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀ@@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ morphic units. The main lithology corresponds to a basal trans- GB S V @@@@@@@PPPPPPPÀÀÀÀÀÀÀ@@@@@PPPPPÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀGranada @@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ gressive conglomerate that changes upward to marly sands and 37º @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ@@@@@PPPPPÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀ@@PPÀÀ @@@@PPPPÀÀÀÀ@@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ@PÀ clays with intercalated coarse breccias and turbiditic layers. In the @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ@@@@@@@@@@@PPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀ@@PPÀÀ Almería@@@@@@@@@PPPPPPPPPÀÀÀÀÀÀÀÀÀ@@@@PPPPÀÀÀÀ R Málaga western part of the Betic Cordillera, olistostromes rest on this se- @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ @@@@PPPPÀÀÀÀA @@@@@@@PPPPPPPÀÀÀÀÀÀÀ quence, which suggests a deep marine basin environment. GH 2. Upper Burdigalian–lower Langhian sequence. This sequence @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ 978 comprises gray calcareous marls, conglomerates, and turbiditic @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ976 EAB sands. The sequence is poorly known because of the scarcity of @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ 121 977 @@@@@@@PPPPPPPÀÀÀÀÀÀÀ Alboran I. well-preserved outcrops. In some places in the central Betics, the 36º WAB @@@@@@@PPPPPPPÀÀÀÀÀÀÀ sequence is covered by olistostromes or by sediments from the @PÀCeuta@@@@@@@PPPPPPPÀÀÀÀÀÀÀ 979 overlying sequence, which implies a deep marine environment for @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ this sequence as well. Thickness ranges from 10 to 50 m. @@PPÀÀ@@@@@@@PPPPPPPÀÀÀÀÀÀÀ SAB @@@@@@@PPPPPPPÀÀÀÀÀÀÀ 3. Upper Langhian–Serravallian sequence. This sequence comprises @@@@@@@PPPPPPPÀÀÀÀÀÀÀ @@@PPPÀÀÀ@@@@@@@@@@@@@@@@@PPPPPPPPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ@@@PPPÀÀÀMelilla the main portion of the middle Miocene deposits and is character- @@PPÀÀ@@@PPPÀÀÀ@@@@@@@@@@@@@@@@@PPPPPPPPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ@@@PPPÀÀÀ ized by a complete transgressive to regressive sedimentary cycle. 35º @@PPÀÀ@@@PPPÀÀÀ@@@@@@@@@@@@@@@@@PPPPPPPPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ The lower part of the sequence is composed of continental red con- @@@@@@@@@@@@@@@@@PPPPPPPPPPPPPPPPPÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ 5º 4º 3º 2º glomerates, calcareous marls, bioclastic calcarenites, and marls @@@@@PPPPPÀÀÀÀÀNeogene basins with interbedded turbidite layers. Depositional environments @@@@@PPPPPÀÀÀÀÀon land Alboran Domain range from continental to shallow and deep marine. Coarse clastic @@@@@PPPPPÀÀÀÀÀ @@@@PPPPÀÀÀÀ formations occur at the upper part of the sequence, which was de- Volcanic rocks Early Miocene @@@@PPPPÀÀÀÀ Mud diapirs posited in continental or marine environments, depending on the @@@@PPPPÀÀÀÀ location. Occasional lacustrine sediments with gypsum and lignite South Iberian and 1 Sedimentary 2 are also present (La Peza and Umbria Formations; Rodríguez- Maghrebian Domain 3 depocenters Fernández, 1982; Völk and Rondeel, 1964). Flysch Trough units Fault, normal fault 4. Tortonian sequence. The sedimentary record of this age consists of two parts, of lower and upper Tortonian age. The lower Torto- Figure 2. Geologic sketch of the Alboran Sea basin showing the location of nian sediments lie unconformably on the Alpujárride units and in main sedimentary depocenters, DSDP Site 121, and Leg 161 sites. Betic some places over Nevado-Filábride units. In the eastern Alboran Neogene Basins outcrops (mainly Miocene to Pliocene marine sediments) Domain (Eastern Betic Cordillera), continental red conglomerates onshore
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