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A microfacies study of the sedimento...

Kim, Kyou Ho.

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A microfacies study of the sedimentology and diagenesis of the Formosa Reef Limestone (Middle Devonian), southwestern Ontario.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A microfacies study of the sedimentology and diagenesis of the Formosa Reef Limestone (Middle Devonian), southwestern Ontario./
作者:	Kim, Kyou Ho.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1992,
面頁冊數:	376 p.
附註:	Source: Masters Abstracts International, Volume: 32-06, page: 1612.
Contained By:	Masters Abstracts International32-06.
標題:	Paleoecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MM87243
ISBN:	9780315872431

A microfacies study of the sedimentology and diagenesis of the Formosa Reef Limestone (Middle Devonian), southwestern Ontario.
Kim, Kyou Ho.

A microfacies study of the sedimentology and diagenesis of the Formosa Reef Limestone (Middle Devonian), southwestern Ontario. - Ann Arbor : ProQuest Dissertations & Theses, 1992 - 376 p.

Source: Masters Abstracts International, Volume: 32-06, page: 1612.

Thesis (M.Sc.)--University of Toronto (Canada), 1992.

Well-preserved outcrops of the early Middle Devonian Formosa Reef Limestone are present in Bruce and Huron Counties, southwestern Ontario. The reefs (pure calcite) occur at several different levels within the Amherstburg Formation (pure dolomite) of the Detroit River Group. The main reef-building fossils are tabular stromatoporoids and colonial corals. The reefs appear to have grown in warm (perhaps above 25$\sp\circ$C), shallow (mostly above fair-weather wave base), slightly to strongly agitated subtidal environments. The reefs lack massive framework structures. They appear to have been built primarily through binding by stromatoporoids, and baffling by crinoids, rugose corals, and bryozoans. As the reefs grew in subtropical zone (approximately 22$\sp\circ$S), they also were sometimes subjected to strong destructive processes by storm.

ISBN: 9780315872431Subjects--Topical Terms:

608789
Paleoecology.

A microfacies study of the sedimentology and diagenesis of the Formosa Reef Limestone (Middle Devonian), southwestern Ontario.
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245 1 2 $a A microfacies study of the sedimentology and diagenesis of the Formosa Reef Limestone (Middle Devonian), southwestern Ontario.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1992
300 $a 376 p.
500 $a Source: Masters Abstracts International, Volume: 32-06, page: 1612.
500 $a Adviser: David R. Kobluk.
502 $a Thesis (M.Sc.)--University of Toronto (Canada), 1992.
520 $a Well-preserved outcrops of the early Middle Devonian Formosa Reef Limestone are present in Bruce and Huron Counties, southwestern Ontario. The reefs (pure calcite) occur at several different levels within the Amherstburg Formation (pure dolomite) of the Detroit River Group. The main reef-building fossils are tabular stromatoporoids and colonial corals. The reefs appear to have grown in warm (perhaps above 25$\sp\circ$C), shallow (mostly above fair-weather wave base), slightly to strongly agitated subtidal environments. The reefs lack massive framework structures. They appear to have been built primarily through binding by stromatoporoids, and baffling by crinoids, rugose corals, and bryozoans. As the reefs grew in subtropical zone (approximately 22$\sp\circ$S), they also were sometimes subjected to strong destructive processes by storm.
520 $a Based upon various data recorded using a new computer program, a total of eleven microfacies are classified in the study area. The stromatoporoid biolithite (microfacies 10) is most common throughout the Formosa reefs. This microfacies often alternates with microfacies 5 (fossiliferous calcilutite). In some localities, the microfacies changes from low-energy microfacies to high-energy microfacies in a systematic fashion.
520 $a The diagenesis of the Formosa reefs began in marine phreatic diagenetic environments. During mid-Detroit River regression, the reefs were first exposed to meteoric vadose processes in which most aragonite carbonate grains were dissolved away, resulting in abundant secondary pore spaces (molds and vugs). The reefs subsequently appear to have been altered in the meteoric-phreatic environment in which clear, blocky calcite spar cements filled or lined most pre-existing primary and secondary pore spaces. As the Formosa reefs were buried later, various burial diagenetic products (e.g. stylolites, solution seams, poikilotopic cements).
520 $a Local mixing-zone model is suggested to interpret how the Formosa Reef Limestone escaped the regional dolomitization. During mid-Detroit River regression, local mixing zones developed along the reef margins where marine waters occasionally recharged from marine or adjacent lagoonal areas met the meteoric pore waters recharged through exposed reefs. In these local mixing zones, various diagenetic processes (neomorphism, cementation, dolomitization, and dedolomitization) appear to have occurred depending on the degree of dilution by the meteoric water. As a result, the permeability rapidly decreased near the individual reef margins. It caused the limited migration of dolomitizing fluids between the reefs and the interreef rocks because the reefs were sealed off. This interpretation also provides a clue for geologically specific situation that the completely different two units in mineralogy (the Formosa Reef Limestone and the Amherstburg Dolomite) coexist in this local area.
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