Physico—chemical and biological data of meromictic anchihaline cave lagoons

Martínez-Taberner, A.; Carey, Philip G.; Sintes, Eva

doi:10.1080/03680770.1998.11901648

Cited by 1 publication

(4 citation statements)

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“…, 1985). Below the water–air interface, pool waters become progressively more dense and saline, leading to stratification of the pool that inhibited mixing (Martínez‐Taberner et al. , 2000; Carey et al.…”

Section: Discussionmentioning

confidence: 99%

“…The hydrology of Mallorca's coastal system is typical of many limestone islands (Price & Herman, 1991), in which a lens of groundwater floats on saline water of nearly marine composition. In the modern coastal caves of Mallorca, however, freshwater lenses develop only in very rainy years (Martínez‐Taberner et al. , 2000).…”

Section: Geological and Hydrological Settingmentioning

confidence: 99%

“…In fact, the pools of Cala Varques cave typically are brackish. Many of the coastal cave pools show little vertical variation in temperature or pH, but show an increase in salinity and a decrease in dissolved oxygen concentration with depth (Martínez‐Taberner et al. , 2000; Carey et al.…”

Section: Geological and Hydrological Settingmentioning

confidence: 99%

“…(1981b) described the morphological, mineralogical and textural characteristics of these speleothems, and Herman et al. (1985), Price & Herman (1991), Martínez‐Taberner et al. (2000) and Carey et al.…”

Section: Introductionmentioning

confidence: 98%

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Pleistocene speleothems of Mallorca: implications for palaeoclimate and carbonate diagenesis in mixing zones

2005

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The Pleistocene speleothems of Sa Bassa Blanca cave, Mallorca, are excellent indicators of palaeoclimate variations, and are samples that allow evaluation of the products and processes of mixing-zone diagenesis in an open-water cave system. Integrated stratigraphic, petrographic and geochemical data from a horizontal core of speleothem identified two main origins for speleothem precipitates: meteoric-marine mixing zone and meteoric-vadose zone. Mixing-zone precipitates formed at and just below the water-air interface of cave pools during interglacial times, when the cave was flooded as a result of highstand sea-level. Mixing-zone precipitates include bladed and dendritic high-Mg calcite, microporous-bladed calcite with variable Mg content, and acicular aragonite; their presence suggests that calcium-carbonate cementation is significant in the studied mixing-zone system. Fluid inclusion salinities, d 13 C and d 18 O compositions of the mixing-zone precipitates suggest that mixing ratio was not the primary control on whether precipitation or dissolution occurred, rather, the proximity to the water table and degassing of CO 2 at the interface, were the major controls on precipitation. Thus, simple two-end-member mixing models may apply only in mixing zones well below the water table. Meteoric-vadose speleothems include calcite and high-Mg calcite with columnar and bladed morphologies. Vadose speleothems precipitated during glacial stages when sea level was lower than present. Progressive increase in d 13 C and d 18 O of the vadose speleothems resulted from cooling temperatures and more positive seawater d 18 O associated with glacial buildup. Such covariation could be considered as a valid alternative to models predicting invariant d 18 O and highly variable d 13 C in meteoric calcite. Glacio-eustatic oscillations of sea-level are recorded as alternating vadose and mixing-zone speleothems. Short-term climatic variations are recorded as alternating aragonite and calcite speleothems precipitated in the mixing zone. Fluidinclusion and stable-isotope data suggest that aragonite, as opposed to calcite, precipitated during times of reduced meteoric recharge.

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Section: Discussionmentioning

confidence: 99%

Section: Geological and Hydrological Settingmentioning

confidence: 99%

Section: Geological and Hydrological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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