Geology, with special reference to the Precambrian

Cooray, P. G.

doi:10.1007/978-94-009-6545-4_1

Cited by 20 publications

(25 citation statements)

References 14 publications

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“…Data sources: Prame (1991), Schenk et al (1991). or unfolded or intersliced fragments of the Highland Complex. These are similar to the Kataragama Klippe which is derived from the latter complex (Cooray 1984, Vitanage 1985.…”

Section: Fig 1 Map Of Sri Lanka Showing the Main Lithotectonic Unitsupporting

confidence: 55%

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The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka

Dissanayake¹,

Chandrajith²,

Tobschall³

2000

Bull Geol Soc Finland

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The gem deposits of Sri Lanka are studied from the point of view of their geology, mineralogy and geochemistry. Nearly all the gem formations are located in the central high-grade metamorphic terrain of the Highland Complex. The gem deposits are classified as sedimentary, metamorphic and magmatic; the sedimentary types being the most abundant. The mineralogy of the gem deposits varies widely with, among others, corundum, chrysoberyl, beryl, spinel, topaz, zircon, tourmaline, garnet and sphene being common. Rare element concentrations in sediments from the three main gem fields of Sri Lanka, namely Ratnapura, Elahera and Walawe, were studied. It was found that some sediments are considerably enriched in certain elements compared to their average continental crustal abundances. The Walawe Ganga sediments show anomalous enrichments of the high field strength and associated elements, particularly Zr, Hf, W and Ti. This is attributed to the presence of accessory minerals such as zircon, monazite and rutile. Some of these heavy minerals comprise as much as 50 wt% of sediment. The geochemical enrichment of some trace elements compared to their average crustal abundances indicates that highly differentiated granites and associated pegmatites have provided the source materials for enrichment.

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Section: Fig 1 Map Of Sri Lanka Showing the Main Lithotectonic Unitsupporting

confidence: 55%

“…Silva and Siriwardena (1988) described an example of a corundum-bearing skarn deposit, located at Bakamuna near the main Elahera gem field. Cooray (1984), and Wadia and Fernando (1945) describe some other examples of this type, at Elahera and at Ohiya respectively.…”

Section: Skarn and Calcium-rich Rock Typesmentioning

confidence: 99%

The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka

Dissanayake¹,

Chandrajith²,

Tobschall³

2000

Bull Geol Soc Finland

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“…This forest region receives an annual rainfall of 5016 mm, with little seasonality, and annual minimum and maximum temperatures of 22 and 28 8C (Munidasa et al, 2002). The topography is steeply undulating with metamorphic rocks overlain with ultisols (USDA, 1975;Cooray, 1984;Panabokke, 1996).…”

Section: Site Descriptionmentioning

confidence: 99%

Ectomycorrhizal colonization and seedling growth of Shorea (Dipterocarpaceae) species in simulated shade environments of a Sri Lankan rain forest

Tennakoon

Gunatilleke

Hafeel

et al. 2005

Forest Ecology and Management

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“…The Sinharaja FDP is representative of the 'ridge-steep slopevalley' landscape of the lowland through mid-elevational rain forests of south-western Sri Lanka. This landform is a result of differential weathering and erosion of lithologically less-resistant Precambrian metamorphic bedrock along structurally controlled parallel strike ridges and valleys (Cooray 1984, Erb 1984).…”

Section: Study Areamentioning

confidence: 99%

Species–habitat associations in a Sri Lankan dipterocarp forest

et al. 2006

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Forest structure and species distribution patterns were examined among eight topographically defined habitats for the 205 species with stems > 1 cm dbh inhabiting a 2 5-ha plot in the Sinharaja rain forest, Sri Lanka. The habitats were steep spurs, less-steep spurs, steep gullies and less-steep gullies, all at either lower or upper elevations. Mean stem density was significantly greater on the upper spurs than in the lower, less-steep gullies. Stem density was also higher on spurs than in gullies within each elevation category and in each upper-elevation habitat than in its corresponding lower-elevation habitat. Basal area varied less among habitats, but followed similar trends to stem density. Species richness and Fisher's alpha were lower in the upper-elevation habitats than in the lower-elevation habitats. These differences appeared to be related to the abundances of the dominant species. Of the 125 species subjected to torus-translation tests, 99 species (abundant and less abundant and those in different strata) showed at least one positive or negative association to one or more of the habitats. Species associations were relatively more frequent with the lower-elevation gullies. These and the previous findings on seedling ecophysiology, morphology and anatomy of some of the habitat specialists suggest that edaphic and hydrological variation related to topography, accompanied by canopy disturbances of varying intensity, type and extent along the catenal landscape, plays a major role in habitat partitioning in this forest.

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Geology, with special reference to the Precambrian

Cited by 20 publications

References 14 publications

The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka

The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka

Ectomycorrhizal colonization and seedling growth of Shorea (Dipterocarpaceae) species in simulated shade environments of a Sri Lankan rain forest

Species–habitat associations in a Sri Lankan dipterocarp forest

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