Limestone Blocks in the Lower Cretaceous Cuche Formation of the Central Range, Trinidad, B.W.I.

Barr, Kenny

doi:10.1017/s0016756800068126

Cited by 6 publications

(1 citation statement)

References 1 publication

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“…The only exposure of the Paleocene limestone of the Soldado Formation is on Soldado Rock, located about 10 km off Icacos Point on the southwestern peninsula of Trinidad (Figure 1). The Miocene is represented in the Central Range by the Guaracara Limestone of the Tamana Formation, which represents the last significant carbonate production in Trinidad (Barr 1952; Sutter 1954; Kugler 1959; Erlich et al . 1993; Donovan 1994; Babb and Mann 1999; Johnson 2001) (Figure 1).…”

Section: Geologic Context and The Carbonate Rocksmentioning

confidence: 99%

The karstlands of Trinidad and Tobago, their land use and conservation

Day¹,

Chenoweth²

2004

Geographical Journal

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The karst landscapes of Trinidad and Tobago, although restricted in area, present a previously undocumented array of tropical karst landforms, including karren, caves, springs, valley systems, and a range of dolines or sinkholes, including an area of polygonal cockpit karst. The karstlands are located primarily in the Northern and Central Ranges of Trinidad and in the southwestern portion of Tobago, and they have developed on carbonate rocks ranging in age from Jurassic to Quaternary. Associated with them is a range of vegetation types and faunal communities, many of which have been much altered by human land management, including forestry and agriculture. Quarrying has destroyed much of the karst in the western part of Trinidad, and urban development and tourism have taken their toll too, especially in the Lowlands of western Tobago. Little of the karst is incorporated within existing protected areas.

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Section: Geologic Context and The Carbonate Rocksmentioning

confidence: 99%

The karstlands of Trinidad and Tobago, their land use and conservation

Day¹,

Chenoweth²

2004

Geographical Journal

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Chapter 18 Structural and sedimentary development of a neogene transpressional plate boundary between the caribbean and South America plates in Trinidad and the Gulf of paria

Babb¹,

Mann²

1999

Sedimentary Basins of the World

131

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Structure and deformation history of the northern range of Trinidad and adjacent areas

Algar¹,

Pindell²

1993

Tectonics

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Conflicting models have been proposed for both the evolution of northern South America and the neotectonics of the south Caribbean plate boundary zone. The Trinidadian portion of the margin is particularly controversial, but surprisingly it has been little studied. We present a structural analysis of Trinidad's Northern Range, pertinent updates of the island's stratigraphy and sedimentology, and new zircon fission track age determinations, and use them to constrain Trinidad's geologic history, and to better understand the controlling tectonic processes. In our interpretation Trinidad's three E‐ENE striking ranges, which are separated by late Neogene‐Recent depocenters, expose (1) the Northern Range Group, generally greenschist‐metamorphosed Upper Jurassic to Cretaceous north facing continental slope sediments of the Northern Range, deposited on the northern South American passive margin 200–400 km to the WNW, and (2) the Trinidad Group, Cretaceous‐Paleogene shelf slope sediments of the central and southern Trinidad deposited less than 100 km WNW of their present location. A small allochthon composing the Sans Souci Group Cretaceous tholeiitic volcaniclastic, basaltic, and gabbroic rocks (Sans Souci Formation) and sediments (Toco Formation) now in the northeastern Northern Range, has been transported hundreds of kilometers from the west with the Caribbean Plate. Despite earlier references to Cretaceous orogenesis, all deformation in Trinidad is of Cenozoic age. The first deformation in the Northern Range (D1) formed north vergent nappes and induced greenschist metamorphism, probably in the Late Eocene or Oligocene. The nappes developed either by the underthrusting of the Proto‐Caribbean crust beneath South America due to convergence between North and South America, or as gravity slides caused by oversteepening induced by this convergence and/or the passage of the Caribbean Plate's peripheral bulge and arrival of its foredeep. Northern Range D2 deformation is south vergent and represents the incorporation of Northern Range metasediments into the Caribbean accretionary prism. The transition to D3 brittle transpressive right‐lateral strike‐slip faulting is interpreted to be due to the uplift and east‐southeastward transpressive emplacement of Northern Range/Caribbean prism rocks onto the South American stepped shelf. This emplacement formed the Miocene transpressive thrust belts and foreland basin in central and southern Trinidad. In the final phase of Northern Range deformation (D4) ∼E‐W normal faults and shear zones and conjugate NNW‐SSE and NE‐SW normal faults developed, and displacement on preexisting ∼E‐W right‐lateral strike‐slip faults continued. The 11 Ma Northern Range zircon fission track ages suggest rapid uplift from the Late Miocene to Recent. Late Miocene subsidence of the Tobago platform immediately to the north of the Northern Range, and greater than 3 km of normal, down to the north, displacement indicated for the North Coast Fault Zone separating the Northern Range and Tobago platform, leads us to p...

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Limestone Blocks in the Lower Cretaceous Cuche Formation of the Central Range, Trinidad, B.W.I.

Cited by 6 publications

References 1 publication

The karstlands of Trinidad and Tobago, their land use and conservation

The karstlands of Trinidad and Tobago, their land use and conservation

Chapter 18 Structural and sedimentary development of a neogene transpressional plate boundary between the caribbean and South America plates in Trinidad and the Gulf of paria

Structure and deformation history of the northern range of Trinidad and adjacent areas

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