Upper Miocene Reef Complex of the Llucmajor Area, Mallorca, Spain

Pomar, Luis; Ward, William C.; Green, Darryl G.

doi:10.2110/csp.96.01.0191

Cited by 55 publications

(59 citation statements)

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“…Upper Miocene rocks crop out on all Balearic Islands and have been subdivided into three sedimentary units (Pomar et al , 1996Barón and Pomar 1985) interpreted as third-order depositional sequences sensu Haq et al (1988) (Pomar et al 1996): (1) The Lower Tortonian ''Lower Bar Unit'' on Menorca (Obrador et al 1983(Obrador et al , 1992Pomar 2001;Pomar et al 2002), corresponds to the ''Heterostegina Calcisiltites'' sensu Pomar et al (1996) of Mallorca and is the focus of the study presented here. (2) The Upper Tortonian-Lower Messinian unit is termed ''Reef Complex'' (Obrador et al 1983) and consists of a progradational coralreef platform (Pomar 1991(Pomar , 2001Pomar et al 1996).…”

Section: Study Areamentioning

confidence: 99%

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Extrapolation of depositional geometries of the Menorcan Miocene carbonate ramp with ground-penetrating radar

Asprion

Westphal

Nieman³

et al. 2008

Facies

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The Tortonian carbonate ramp of Menorca was previously studied on the basis of outcrops along sea-cliff outcrops. These sea cliffs, in combination with inland water wells, are the basis for a facies model for the reconstruction of the internal architecture and for characterizing the internal heterogeneities of this carbonate platform. However, any such three-dimensional reconstruction is generally limited by the given geometrical arrangement of the twodimensional outcrops and the uncertainties of correlation with the one-dimensional wells. Here, ground-penetrating radar (GPR) has been employed in order to test and refine the depositional model. Although GPR is well known for being an excellent tool for high-resolution underground studies of sedimentary systems, the application for studying carbonate rocks is still far from routine. The reason for this discrepancy is two-fold: the minor mineralogical contrast between lithologies in carbonate rocks results in subtle reflections, and, even more important, the porosity structure in carbonates is thoroughly and repeatedly changed during diagenesis, commonly across the different facies, leading to problems in predictability of the petrophysical properties. The study of the Menorcan carbonate ramp with large distance-deep penetration GPR sections demonstrates that in spite of these difficulties, GPR is a valuable tool for extrapolating information from outcrops and wells. It is useful for characterizing heterogeneities larger than outcrop scale.

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Section: Study Areamentioning

confidence: 99%

“…(2) The Upper Tortonian-Lower Messinian unit is termed ''Reef Complex'' (Obrador et al 1983) and consists of a progradational coralreef platform (Pomar 1991(Pomar , 2001Pomar et al 1996). On Menorca outcrops of the ''Reef Complex'' are limited to a small area south of Maó ( Fig.…”

Section: Study Areamentioning

confidence: 99%

Extrapolation of depositional geometries of the Menorcan Miocene carbonate ramp with ground-penetrating radar

Asprion

Westphal

Nieman³

et al. 2008

Facies

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“…The Llucmajor platform, with reefs mostly constructed by 1-3 coral genera, prograded for ~20 km (Pomar and Ward, 1994;Pomar et al, 1996). Mudstonewackestones to packstones with miliolids, peloids, and locally vertical root molds (inner lagoon) pass basinward into skeletal grainstone-packstone with coral patch reefs (outer lagoon).…”

Section: Introductionmentioning

confidence: 99%

Changes in coral-reef structure through the Miocene in the Mediterranean province: Adaptive versus environmental influence

Pomar

Hallock

2007

Geol

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“…3a), where the coral buildings are omnipresent being affected by intense differential dissolution phenomena. On the other hand, the carbonate materials corresponding to the outer lagoon facies (Pomar et al 1996) are quite massive and less permeable than those in the reef front facies. They are affected by an extensive fracturation network in which the SW-NE direction predominate, and show joint-guided galleries whose walls appear completely sculptured by variegated solutional features (Fig.…”

Section: Cave Descriptionmentioning

confidence: 96%

“…From a sedimentological point of view, the Upper Miocene deposits constitute a complex reef sequence related to the well-differentiated depositional environments characteristics of tropical carbonate platforms, with a wide textural variability as a function of the reef architecture related to the sea level oscillations and the resulting depositional environments (Pomar et al 1996). This sedimentological complexity produces sharp lateral and vertical changes of rock facies, which have clear repercussions on the pattern and morphology of the cave.…”

Section: Geological Settingmentioning

confidence: 99%

Solutional features and cave deposits related to hypogene speleogenetic processes in a littoral cave of Mallorca Island (western Mediterranean)

Fornós

Merino

Ginés

et al. 2011

Carbonates Evaporites

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The Cova des Pas de Vallgornera, located in the southern part of Mallorca Island (western Mediterranean) and developed in Upper Miocene reefal carbonate limestones, is an exceptional coastal cave because of its particular morphological features and the presence of deposits with uncommon mineralogies. Littoral mixing dissolution processes represent the most important speleogenetic mechanism to be considered in the eogenetic karst platform, where it develops; nevertheless, part of the cave consists of an extensive network of galleries that show morpho-sedimentary features pointing up to a possible participation of hypogene speleogenesis. The morphological assemblage of the cave illustrates besides the typical coastal karstification, a noticeable meteoric water recharge along with a possible deep recharge of hypogenic character. Features consisting in upwards solutional channels are abundant, including a complete morphologic suite of rising flow supporting the involvement of hypogene speleogenetic processes. Furthermore, the presence of vents and some related speleothems, such as crusts and cave rims, together with Mn and Fe-rich deposits hosting several minerals not observed until present in other caves of the region must be highlighted. Given the monotonous surface geology around the cave, it is suspected that ascending Sr, Ba, Mn, and Al-rich hypogene solutions may have reacted with the host rock to form this unique mineral assemblage.These deep-seated speleogenetic and mineralogical phenomena could be associated with the feeble geothermal anomalies existing currently in the Llucmajor platform, related to SW-NE faults which delimitate the subsidence basin existing in the southern end of Mallorca Island.

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Upper Miocene Reef Complex of the Llucmajor Area, Mallorca, Spain

Cited by 55 publications

References 0 publications

Extrapolation of depositional geometries of the Menorcan Miocene carbonate ramp with ground-penetrating radar

Extrapolation of depositional geometries of the Menorcan Miocene carbonate ramp with ground-penetrating radar

Changes in coral-reef structure through the Miocene in the Mediterranean province: Adaptive versus environmental influence

Solutional features and cave deposits related to hypogene speleogenetic processes in a littoral cave of Mallorca Island (western Mediterranean)

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