tailieunhanh - CUEVA DE VILLA LUZ, TABASCO, MEXICO: RECONNAISSANCE STUDY OF AN ACTIVE SULFUR SPRING

Systematic excavations began at Herculaneum in 1738 and ten years later at Pompeii. In subsequent years, archaeologists found villas and homes with furnishings and works of art preserved in the volcanic ash. The Villa dei Papiri in Herculaneum was found buried with more than eighty statues and about a thousand ancient papyri (scrolls) inscribed with Greek texts. Modern knowledge of ancient Greek and Roman culture is largely based on what was unearthed in excavations at Pompeii, Herculaneum, and the other sites around the Bay of Naples. News of the excavations spread quickly throughout Europe and sparked the public’s fascination with ancient Greek and Roman culture. Numerous poets and writers drafted imagined stories about life in. | Louise D. Hose and James A. Pisarowicz - Cueva de Villa Luz Tabasco Mexico Reconnaissance Study of an Active Sulfur Spring Cave and Ecosystem. Journal of Cave and Karst Studies 61 1 13-21. CUEVA DE VILLA LUZ TABASCO MEXICO RECONNAISSANCE STUDY OF AN ACTIVE SULFUR SPRING CAVE AND ECOSYSTEM Louise D. Hose Department of Environmental Studies Westminster College Fulton MO 65251 USA James a. Pisarowicz Wind Cave National Park Hot Springs SD 57747 USA Cueva de Villa Luz . Cueva de las Sardinas in Tabasco Mexico is a stream cave with over a dozen H2S-rich springs rising from the floor. Oxidation of the H2S in the stream results in abundant suspended elemental sulfur in the stream which is white and nearly opaque. Hydrogen sulfide concentrations in the cave atmosphere fluctuate rapidly and often exceed . government tolerance levels. Pulses of elevated carbon monoxide and depleted oxygen levels also occasionally enter the cave. Active speleogenesis occurs in this cave which is forming in a small block of Lower Cretaceous limestone adjacent to a fault. Atmospheric hydrogen sulfide combines with oxygen and water to form sulfuric acid probably through both biotic and abiotic reactions. The sulfuric acid dissolves the limestone bedrock and forms gypsum which is readily removed by active stream flow. In addition carbon dioxide from the reaction as well as the spring water and cave atmosphere combines with water. The resultant carbonic acid also dissolves the limestone bedrock. A robust and diverse ecosystem thrives within the cave. Abundant chemoautotrophic microbial colonies are ubiquitous and apparently act as the primary producers to the cave s ecosystem. Microbial veils resembling soda straw stalactites draperies and u-loops suspended from the ceiling and walls of the cave produce drops of sulfuric acid with pH values of . Copious macroscopic invertebrates particularly midges and spiders eat the microbes or the organisms that graze on the microbes. A .

• Đầu tư Bất động sản
• Hydrocolloids
• Food Industry
• Emulsifying Properties
• Hydrolized Sunflower
• Lecithins by Phospholipases
• Different Sources
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