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Shallow Water Carbonate Sediments of...

Humphreys, Alexander Fendrich.

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Shallow Water Carbonate Sediments of the Galapagos Archipelago: Ecologically Sensitive Biofacies in a Transitional Oceanographic Environment.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shallow Water Carbonate Sediments of the Galapagos Archipelago: Ecologically Sensitive Biofacies in a Transitional Oceanographic Environment./
作者:	Humphreys, Alexander Fendrich.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	179 p.
附註:	Source: Dissertations Abstracts International, Volume: 79-10, Section: B.
Contained By:	Dissertations Abstracts International79-10B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10686680
ISBN:	9780355798661

Shallow Water Carbonate Sediments of the Galapagos Archipelago: Ecologically Sensitive Biofacies in a Transitional Oceanographic Environment.
Humphreys, Alexander Fendrich.

Shallow Water Carbonate Sediments of the Galapagos Archipelago: Ecologically Sensitive Biofacies in a Transitional Oceanographic Environment. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 179 p.

Source: Dissertations Abstracts International, Volume: 79-10, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2018.

This item must not be sold to any third party vendors.

Shallow water carbonate producing organisms are directly controlled by their local oceanography. As a result, long-term environmental signals-stemming from the breakdown of calcareous organisms-can be read from time-averaged carbonate sediments. To better understand these complex biophysical interactions, it is important to study carbonate development within oceanographic transition zones and environments affected by disturbances, such as the El Nino-Southern Oscillation (ENSO). This dissertation represents the first investigation into modern shallow water, soft sediment, carbonate environments of the Galapagos Archipelago, eastern tropical Pacific (ETP). This region is notable for straddling an oceanographic transition zone from tropical oligotrophic to temperate eutrophic-caused by high nutrient and low pH upwelling-and for being directly impacted by ENSO. A top-down approach is followed, which analyzes the biogenic structure of Galapagos sediments and their connection to local and regional oceanography and climate, and then explores how these findings relate to benthic foraminifera-sensitive environmental indicators contained within the sediments. Sediment point counting and statistical models revealed that while these carbonate environments span a biogenic and oceanographic transition comparable to similar settings in the ETP, the proximity of the Galapagos to the ENSO region directly influences its sedimentary structure and distribution. Point counting also revealed a near-absence of benthic foraminifera, which is unusual for ETP, and tropical shallow water carbonates in general. Statistically comparing foraminiferal species composition and diversity to dominant oceanographic parameters revealed the low abundances and distribution of these testate (shelled) single-celled protists to be negatively influenced by the combination of repeated Holocene ENSO events, and the effects of protracted exposure to high nutrient and low pH waters of the southern archipelago. Ultimately, the results of this study may serve as a template for investigating the interaction of carbonates and oceanography within similar atypical tropical assemblages in the fossil record.

ISBN: 9780355798661Subjects--Topical Terms:

516570
Geology.

Shallow Water Carbonate Sediments of the Galapagos Archipelago: Ecologically Sensitive Biofacies in a Transitional Oceanographic Environment.
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