speleothem


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speleothem

[′spē·lē·ə‚them]
(geology)
A secondary mineral deposited in a cave by the action of water. Also known as cave formation.
References in periodicals archive ?
Small (up to 1 m wide, 15 m long and 1.5-2 m high) cave structures with speleothem precipitates, such as botryoidal calcite, spar calcite, barite crystal aggregates and pyrite, are mostly found in the central and southern part of the quarry in the sub-vertical contact zones between limestone and dolomite bodies.
Further support for our contention that euheterodont fibrillar prisms form under predominantly physical controls stems from their apparent similarity to the textures seen in speleothem calcites illustrated by Checa et al.
Experimental natural philosopher, Adam Walker wrote how pouring acid onto limestone caused a chemical reaction, "the effervescence was excessive strong," and he made an early suggestion as to the formation of speleothems, arguing that the rain soaked through the overlying earth and oozed through cracks in the limestone "imbibing or dissolving fine particles in their descent" leaving the "stony particle" in place as the water enters the cave.
The predominantly face and eye motifs pecked into the speleothems of the latter cave share striking similarities with other early sites, such as Cueva de Berna, on the western side of the Mona Passage in the Dominican Republic (Lopez Belando 2003; Veloz Maggiolo et al.
Mineral deposits in water dripping from the roof of the limestone cave splashed onto the cave floor, and mist from those drip water impacts formed delicate rosette-looking speleothems (cave formations) that the divers called 'florets.' It turned out the average of the tooth data also converged to the age obtained from the mineral deposit data.
The decline of the Late Pre-Islamic sites at Mleiha may be linked to increased aridity and major drought, as identified in the Hoti Cave speleothem record, which led to major changes in water availability, desiccation of the water body and the onset of major dune reactivation and migration across the Mleiha landscape.
In nearly all of the warm periods, speleothem layers grew in areas that today have partial permafrost cover, the researchers found.
For western South Island, 'Lorrey et al." also observe that speleothem data "indicate very cold temperatures" over the sixteenth century AD (2008: 71).
Quaternary geology and paleoclimate of Costa Rica: Evidence from glaciations, stable isotopes of surface water, and speleothem. Tesis Ph.D in Earth Sciences.
The chronology of speleothem deposition in northern Yukon and its relationships to permafrost.
Dramatic recent evidence for monsoon behavior comes from long calcite (speleothem) sequences accurately dated by Th/U analysis (Fig.
BRADY, James E., "Speleothem Breakage, Movement, Removal, and Caching: An Aspect of Ancient Maya Cave Modification", Geoarchaeology: An International Journal, v.