Geology of phosphate deposits of northern peninsular Florida

Espenshade, Gilbert H.; Spencer, Charles W.

doi:10.3133/b1118

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…Sediments of the lower Oligocene to Pliocene Hawthorn Group (Th) are thought to have been deposited over the Ocala Platform throughout peninsular Florida, but post-Pliocene erosion and karstification have removed them from the crest of the Ocala Platform (Cooke, 1945;Espenshade and Spencer, 1963;Scott, 1981). Within the mapped area, the Hawthorn Group is composed of sediments from the Arcadia and Peace River formations.…”

Section: Hawthorn Groupmentioning

confidence: 99%

Text to accompany geologic map of the USGS Fort Pierce 30 x 60 minute quadrangle south Florida

2022

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Section: Hawthorn Groupmentioning

confidence: 99%

Text to accompany geologic map of the USGS Fort Pierce 30 x 60 minute quadrangle south Florida

2022

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Discussion of the Occurrence and Origin of Sedimentary Palygorskite-Sepiolite Deposits

Isphording

1973

Clays and clay miner.

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Abstract--Marine and non-marine palygorskite-sepiolite deposits are found throughout the world and occur interbedded with chert, dolomite, limestone, phosphates and other non-detrital sedimentary rocks. The origin of these high-magnesium clays has long been attributed to either alteration of volcanic ash or the structural transformation of smectite clays. More recently, others have argued origin by direct crystallization (neo-formation). Recent laboratory studies support this latter concept, particularly in environments where the concentration of alumina is low, the silica concentration high, and the pH alkaline. Such an origin is proposed for the Georgia-Florida deposits in southeastern United States, since major obstacles exist against formation by alteration of volcanic ash or by transformarion of smectites. Lateritic weathering during the Miocene would have favored direct precipitation of these clays in the shallow, marginal seas. The basinward increase in the MgO: AI~O3 ratio is further support.Deep weathering of crystalline rocks in northern British Honduras and Guatemala would have produced similar high silica, low alumina conditions on the adjacent submerged Yucatan Platform during the late Tertiary. The seaward increase in the MgO:Al203 ratio, the lack of associated detrital constituents, and the absence of associated smectites strongly indicate a similar origin by direct crystallization of these Yucatan palygorsldte-sepiolite clays.Some occurrences of palygorskite and sepiolite may well be related to the alteration of smectite clays or volcanic ash. However, many of the large sedimentary deposits are more probably the result of direct crystallization adjacent to areas undergoing tropical or subtropical weathering.

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Mineral resource potential map of the Farles Prairie and Buck Lake Roadless Areas, Marion County, Florida

Cathcart¹,

Patterson²,

Crandall³

1983

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Geology of phosphate deposits of northern peninsular Florida

Cited by 6 publications

References 3 publications

Text to accompany geologic map of the USGS Fort Pierce 30 x 60 minute quadrangle south Florida

Text to accompany geologic map of the USGS Fort Pierce 30 x 60 minute quadrangle south Florida

Discussion of the Occurrence and Origin of Sedimentary Palygorskite-Sepiolite Deposits

Mineral resource potential map of the Farles Prairie and Buck Lake Roadless Areas, Marion County, Florida

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