Late‐Quaternary miliolite (biogenic carbonate) deposits and their implications for sea‐level fluctuations and climatic variability

2021 ◽  
Author(s):  
A. Durga Prasad ◽  
Falguni Bhattacharya ◽  
Gaurav Chauhan ◽  
D. Balaji ◽  
M.G. Thakkar ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Climatic Variability ◽  
Biogenic Carbonate ◽  
Sea Level Fluctuations ◽  
Carbonate Deposits

The Origin of Modern Atolls: Challenging Darwin's Deeply Ingrained Theory

2021 ◽  
Vol 13 (1) ◽  
pp. 537-573 ◽  
Author(s):  
André W. Droxler ◽  
Stéphan J. Jorry
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Direct Interaction ◽  
Evolutionary Model ◽  
Reef Growth ◽  
Sea Level Fluctuations ◽  
Fringing Reefs ◽  
Volcanic Islands ◽  
Karst Model ◽  
The Tropical Pacific

In 1842, Darwin identified three types of reefs: fringing reefs, which are directly attached to volcanic islands; barrier reefs, which are separated from volcanic islands by lagoons; and ring reefs, which enclose only a lagoon and are defined as atolls. Moreover, he linked these reef types through an evolutionary model in which an atoll is the logical end point of a subsiding volcanic edifice, as he was unaware of Quaternary glaciations. As an alternative, starting in the 1930s, several authors proposed the antecedent karst model; in this model, atolls formed as a direct interaction between subsidence and karst dissolution that occurred preferentially in the bank interiors rather than on their margins through exposure during glacial lowstands of sea level. Atolls then developed during deglacial reflooding of the glacial karstic morphologies by preferential stacked coral-reef growth along their margins. Here, a comprehensive new model is proposed, based on the antecedent karst model and well-established sea-level fluctuations during the last 5 million years, by demonstrating that most modern atolls from the Maldives Archipelago and from the tropical Pacific and southwest Indian Oceans are rooted on top of late Pliocene flat-topped banks. The volcanic basement, therefore, has had no influence on the late Quaternary development of these flat-topped banks into modern atolls. During the multiple glacial sea-level lowstands that intensified throughout the Quaternary, the tops of these banks were karstified; then, during each of the five mid-to-late Brunhes deglaciations, coral reoccupied their raised margins and grew vertically, keeping up with sea-level rise and creating the modern atolls.

Anatomy of a late Quaternary carbonate island: Constraints on timing and magnitude of sea-level fluctuations, West Caicos, Turks and Caicos Islands, BWI

2019 ◽  
Vol 205 ◽  
pp. 193-223 ◽  
Author(s):  
Charles Kerans ◽  
Chris Zahm ◽  
Steven L. Bachtel ◽  
Paul Hearty ◽  
Hai Cheng
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Turks And Caicos Islands ◽  
Sea Level Fluctuations ◽  
Island Constraints

Significance of relic carbonate deposits along the central and southwestern margin of India for late Quaternary environmental and sea level changes

2003 ◽  
Vol 159 (1-2) ◽  
pp. 95-111 ◽  
Author(s):  
V.Purnachandra Rao ◽  
L. Montaggioni ◽  
K.H. Vora ◽  
F. Almeida ◽  
K.M. Rao ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Sea Level Changes ◽  
Southwestern Margin ◽  
Carbonate Deposits ◽  
And Sea Level

Compositional variations in calciturbidites due to sea-level fluctuations, late Quaternary, Bahamas

1989 ◽  
Vol 78 (2) ◽  
pp. 477-486 ◽  
Author(s):  
Alfred B. Haak ◽  
Wolfgang Schlager
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Sea Level Fluctuations ◽  
Compositional Variations
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