caa a22 4500 469045566 CHVBK 20180323132823.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02536806 doi (NATIONALLICENCE)springer-10.1007/BF02536806 Potthast Ina Geologisches Institut, Universität Bern, Baltzerstraße 1, CH-3012, Bern aut Short-term progressive early diagenesis in density bands of recent corals: Porites Colonies, Mauritius Island, Indian Ocean [Elektronische Daten] [Ina Potthast] Summary: The growth history of some recentPorites colonies of Mauritius Island (Indian Ocean) was dated by sclerochronological methods. Couples of high-density and low-density bands represent the annual growth rate of the corals and allow the growth pattern of every year in the corallum to be counted. The growth and structure of the skeletons ofPorites solida andPorites lutea were investigated. Older parts of the aragonitic skeleton in these 10 to 20 year old corals show various secondary microstructures resulting from alterations and thickenings of the elements of the skeleton. The primary needle-like aragonite crystals are absent in older parts of the corallum and blocky aragonitic cements can occur. Pores and primary skeletal elements are overgrown by new microstructures. These microstructures are caused by secondary cementation and exhibit frontal zones (Stirnzonen), zigzag-like and pseudolamellar-structures. The lamellar structures can be compared with similar structures in the exoskeleton of some Rugosa. A very short early diagenesis within the recent corals is responsible for the thickening and alteration of skeletal elements. It occurs only 4 to 5 years after the formation of the skeleton and tends to increase in importance in older parts of the corallum. Nevertheless, there is no proof for any alteration of aragonite to calcite. Institut für Paläontologie, Universität Erlangen, 1992 Reef corals nationallicence Growth structures nationallicence Microstructures nationallicence Diagenesis nationallicence Mauritius Island nationallicence Holocene nationallicence Facies Springer-Verlag 27/1(1992-12-01), 105-111 0172-9179 27:1<105 1992 27 10347 https://doi.org/10.1007/BF02536806 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02536806 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Potthast Ina Geologisches Institut, Universität Bern, Baltzerstraße 1, CH-3012, Bern aut NATIONALLICENCE 773 0- Facies Springer-Verlag 27/1(1992-12-01), 105-111 0172-9179 27:1<105 1992 27 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer