The stratigraphy and palaeontology of Cape Vani, Milos, Greece
© 2005 Jessica Goffe Milos, dominated by Pliocene-Recent explosive calc-alkaline volcanics, is in the active Aegean Arc. This project investigated the microfauna and depositional environment of a sequence associated with the only terrestrial white smoker field in the world. White smokers occur in a...
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ftumelbourne:oai:jupiter.its.unimelb.edu.au:11343/36892 2024-06-02T08:13:26+00:00 The stratigraphy and palaeontology of Cape Vani, Milos, Greece Coffey, Jessica 2005 http://hdl.handle.net/11343/36892 eng eng Coffey, J. (2005). The stratigraphy and palaeontology of Cape Vani, Milos, Greece. Honours thesis, Science, School of Earth Sciences, The University of Melbourne. http://hdl.handle.net/11343/36892 paleontology geology Stratigraphy Honours thesis 2005 ftumelbourne 2024-05-06T11:43:32Z © 2005 Jessica Goffe Milos, dominated by Pliocene-Recent explosive calc-alkaline volcanics, is in the active Aegean Arc. This project investigated the microfauna and depositional environment of a sequence associated with the only terrestrial white smoker field in the world. White smokers occur in a volcaniclastic-hosted Mn-Fe-Ba deposit in a 1 km2 rift basin associated with dacite intrusives. Although the sediments are extensively hydrothermally altered, they have sedimentary structures and yield a variety of micro- and macrofossils. The typical microfaunal assemblage comprises Miliolinids (e.g. Quinqueloculina spp.; Triloculina spp.) and Elphidiids (Elphidium spp.). In the absence of any planktonic foraminifera, this assemblage is typical of inner shelf palaeodepths from around 10-50m. The occurrence of this fauna with echinoderm spines indicates an open marine setting with normal salinity levels. The associated coarse-grained burrowed facies with symmetrical ripples and hummocky cross stratification and a macrofauna of molluscs (e.g. pectinids, Mytilus, fish teeth) further indicates a shallow marine setting. Terrestrial artiodactyl megafauna occur at three levels in tuff and trough cross-laminated fluvial deposits suggesting close proximity to a regressive shoreline. Macrofauna were probably killed by tephra, rapidly disarticulated and removed into a shallow marine environment. The sequence is unconformably overlain by coarse-grained alluvial fan to braided river deposits deposited when Milos became emergent. Barite-silica white smokers derive from the ingress of and leaching by seawater into basement and overlying volcanics. Palaeontological-boiling data shows the fluid was at 165-140°C and the extremophile echinoderm spicule microfauna dominated because forams were unable to live in warm silica-laden turgid fluids with a high heavy metal content. Other/Unknown Material Planktonic foraminifera The University of Melbourne: Digital Repository |
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Open Polar |
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The University of Melbourne: Digital Repository |
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ftumelbourne |
language |
English |
topic |
paleontology geology Stratigraphy |
spellingShingle |
paleontology geology Stratigraphy Coffey, Jessica The stratigraphy and palaeontology of Cape Vani, Milos, Greece |
topic_facet |
paleontology geology Stratigraphy |
description |
© 2005 Jessica Goffe Milos, dominated by Pliocene-Recent explosive calc-alkaline volcanics, is in the active Aegean Arc. This project investigated the microfauna and depositional environment of a sequence associated with the only terrestrial white smoker field in the world. White smokers occur in a volcaniclastic-hosted Mn-Fe-Ba deposit in a 1 km2 rift basin associated with dacite intrusives. Although the sediments are extensively hydrothermally altered, they have sedimentary structures and yield a variety of micro- and macrofossils. The typical microfaunal assemblage comprises Miliolinids (e.g. Quinqueloculina spp.; Triloculina spp.) and Elphidiids (Elphidium spp.). In the absence of any planktonic foraminifera, this assemblage is typical of inner shelf palaeodepths from around 10-50m. The occurrence of this fauna with echinoderm spines indicates an open marine setting with normal salinity levels. The associated coarse-grained burrowed facies with symmetrical ripples and hummocky cross stratification and a macrofauna of molluscs (e.g. pectinids, Mytilus, fish teeth) further indicates a shallow marine setting. Terrestrial artiodactyl megafauna occur at three levels in tuff and trough cross-laminated fluvial deposits suggesting close proximity to a regressive shoreline. Macrofauna were probably killed by tephra, rapidly disarticulated and removed into a shallow marine environment. The sequence is unconformably overlain by coarse-grained alluvial fan to braided river deposits deposited when Milos became emergent. Barite-silica white smokers derive from the ingress of and leaching by seawater into basement and overlying volcanics. Palaeontological-boiling data shows the fluid was at 165-140°C and the extremophile echinoderm spicule microfauna dominated because forams were unable to live in warm silica-laden turgid fluids with a high heavy metal content. |
format |
Other/Unknown Material |
author |
Coffey, Jessica |
author_facet |
Coffey, Jessica |
author_sort |
Coffey, Jessica |
title |
The stratigraphy and palaeontology of Cape Vani, Milos, Greece |
title_short |
The stratigraphy and palaeontology of Cape Vani, Milos, Greece |
title_full |
The stratigraphy and palaeontology of Cape Vani, Milos, Greece |
title_fullStr |
The stratigraphy and palaeontology of Cape Vani, Milos, Greece |
title_full_unstemmed |
The stratigraphy and palaeontology of Cape Vani, Milos, Greece |
title_sort |
stratigraphy and palaeontology of cape vani, milos, greece |
publishDate |
2005 |
url |
http://hdl.handle.net/11343/36892 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
Coffey, J. (2005). The stratigraphy and palaeontology of Cape Vani, Milos, Greece. Honours thesis, Science, School of Earth Sciences, The University of Melbourne. http://hdl.handle.net/11343/36892 |
_version_ |
1800736953862193152 |