Dyke swarms and associated lava formations in the northern Lebombo monocline, Karoo Large Igneous Province, South Africa
- Klausen, Martin B, Marsh, Julian S, Watkeys, M K
- Authors: Klausen, Martin B , Marsh, Julian S , Watkeys, M K
- Date: 2006
- Language: English
- Type: text , Abstracts
- Identifier: http://hdl.handle.net/10962/132751 , vital:36880
- Description: As one of the early classical examples of plume-generated Large Igneous Provinces (LIPs), the Karoo is characterized by a bulls-eye distribution of High-Ti basalts, picrites, and earliest nephelinites onto a conspicuous triple rift junction (i.e., Okavango dyke swarm and the two Mwenezi and Lebombo monoclines), surrounded by Low-Ti basalts. It is noted that this regional distribution between high-and low-Ti basalts within the Jurassic Karoo LIP differs from that of the Permian Emeishan LIP; thereby undermining the use of this particular feature as evidence for mantle plume involvement.
- Full Text:
- Date Issued: 2006
- Authors: Klausen, Martin B , Marsh, Julian S , Watkeys, M K
- Date: 2006
- Language: English
- Type: text , Abstracts
- Identifier: http://hdl.handle.net/10962/132751 , vital:36880
- Description: As one of the early classical examples of plume-generated Large Igneous Provinces (LIPs), the Karoo is characterized by a bulls-eye distribution of High-Ti basalts, picrites, and earliest nephelinites onto a conspicuous triple rift junction (i.e., Okavango dyke swarm and the two Mwenezi and Lebombo monoclines), surrounded by Low-Ti basalts. It is noted that this regional distribution between high-and low-Ti basalts within the Jurassic Karoo LIP differs from that of the Permian Emeishan LIP; thereby undermining the use of this particular feature as evidence for mantle plume involvement.
- Full Text:
- Date Issued: 2006
Re-estimation of erosion levels in Group I and II kimberlites between Lesotho, Kimberley and Victoria West, South Africa
- Hanson, E Kelsey, Moore, John M, Robey, Julian van Aardt, Bordy, Emese M, Marsh, Julian S
- Authors: Hanson, E Kelsey , Moore, John M , Robey, Julian van Aardt , Bordy, Emese M , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , long abstracts
- Identifier: http://hdl.handle.net/10962/132144 , vital:36804
- Description: The estimation of post-emplacement kimberlite erosion in South Africa through the study of upper-crustal xenoliths is relatively unexplored; however the presence of these xenoliths has been recognized for well over a 100 years. Previously postemplacement erosion levels of a small number of kimberlite pipes have been inferred through the study of the degree of country-rock diagenesis, the depth of sill formation and the depth of the initiation of diatreme facies kimberlite.
- Full Text:
- Date Issued: 2006
- Authors: Hanson, E Kelsey , Moore, John M , Robey, Julian van Aardt , Bordy, Emese M , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , long abstracts
- Identifier: http://hdl.handle.net/10962/132144 , vital:36804
- Description: The estimation of post-emplacement kimberlite erosion in South Africa through the study of upper-crustal xenoliths is relatively unexplored; however the presence of these xenoliths has been recognized for well over a 100 years. Previously postemplacement erosion levels of a small number of kimberlite pipes have been inferred through the study of the degree of country-rock diagenesis, the depth of sill formation and the depth of the initiation of diatreme facies kimberlite.
- Full Text:
- Date Issued: 2006
Supplying lava eruptions in the Karoo Province, South Africa: a geochemical comparison of the volcanic sequence with intrusions in the main Karoo basin
- Marsh, Julian S, Mitha, Vindina R
- Authors: Marsh, Julian S , Mitha, Vindina R
- Date: 2006
- Language: English
- Type: text , abstract
- Identifier: http://hdl.handle.net/10962/132873 , vital:36901
- Description: Magma supply for lava eruptions remains a poorly understood facet of continental flood volcanism. In the Karoo Province a vast complex of dolerite sheets and dykes is exposed in the main Karoo sedimentary basin underlying the flood basalt remnant of Lesotho (Drakensberg Group) suggesting that lavas were erupted locally from a widely distributed network of fissures.
- Full Text:
- Date Issued: 2006
- Authors: Marsh, Julian S , Mitha, Vindina R
- Date: 2006
- Language: English
- Type: text , abstract
- Identifier: http://hdl.handle.net/10962/132873 , vital:36901
- Description: Magma supply for lava eruptions remains a poorly understood facet of continental flood volcanism. In the Karoo Province a vast complex of dolerite sheets and dykes is exposed in the main Karoo sedimentary basin underlying the flood basalt remnant of Lesotho (Drakensberg Group) suggesting that lavas were erupted locally from a widely distributed network of fissures.
- Full Text:
- Date Issued: 2006
The Dominion Group:
- Authors: Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/145144 , vital:38412 , ISBN 9781919908779
- Description: The Dominion Group.
- Full Text:
- Date Issued: 2006
- Authors: Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/145144 , vital:38412 , ISBN 9781919908779
- Description: The Dominion Group.
- Full Text:
- Date Issued: 2006
The emplacement of class 1 kimberlites: part 1, evidence of geological features
- Skinner, E M W, Marsh, Julian S
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , Long abstract
- Identifier: http://hdl.handle.net/10962/132729 , vital:36877
- Description: This paper has been prepared specifically for the September 2006, Kimberlite Emplacement Workshop, Saskatoon, Canada. To this end, emphasis is placed on a big bang/ bottom-up model for the emplacement of Class 1 kimbertite pipes first presented by Clement and Reid (1989) and reinforced by Skinner and Marsh (2004). In this part (Part 1) the evidence of various geological features is presented.
- Full Text:
- Date Issued: 2006
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , Long abstract
- Identifier: http://hdl.handle.net/10962/132729 , vital:36877
- Description: This paper has been prepared specifically for the September 2006, Kimberlite Emplacement Workshop, Saskatoon, Canada. To this end, emphasis is placed on a big bang/ bottom-up model for the emplacement of Class 1 kimbertite pipes first presented by Clement and Reid (1989) and reinforced by Skinner and Marsh (2004). In this part (Part 1) the evidence of various geological features is presented.
- Full Text:
- Date Issued: 2006
The emplacement of class 1 kimberlites: part 2, petrographic evidence
- Skinner, E M W, Marsh, Julian S
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , Long abstract
- Identifier: http://hdl.handle.net/10962/132740 , vital:36878
- Description: This paper has been prepared specifically for the September 2006, Kimberlite Emplacement Workshop, Saskatoon, Canada. To this end, emphasis is placed on a big bang/ bottom-up model for the emplacement of Class 1 kimberlite pipes first presented by Clement and Reid (1989) and reinforced by Skinner and Marsh (2004). In this part (Part 2) petrographic evidence is presented in support of evidence provided by the synthesis of specific geological features as presented in Part 1.
- Full Text:
- Date Issued: 2006
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , Long abstract
- Identifier: http://hdl.handle.net/10962/132740 , vital:36878
- Description: This paper has been prepared specifically for the September 2006, Kimberlite Emplacement Workshop, Saskatoon, Canada. To this end, emphasis is placed on a big bang/ bottom-up model for the emplacement of Class 1 kimberlite pipes first presented by Clement and Reid (1989) and reinforced by Skinner and Marsh (2004). In this part (Part 2) petrographic evidence is presented in support of evidence provided by the synthesis of specific geological features as presented in Part 1.
- Full Text:
- Date Issued: 2006
The Karoo igneous province:
- Duncan, Andrew R, Marsh, Julian S
- Authors: Duncan, Andrew R , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/145156 , vital:38413 , ISBN 9781919908779
- Description: The Karoo igneous province.
- Full Text:
- Date Issued: 2006
- Authors: Duncan, Andrew R , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/145156 , vital:38413 , ISBN 9781919908779
- Description: The Karoo igneous province.
- Full Text:
- Date Issued: 2006
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