Fraction-specific geochemistry across the Asbestos Hills BIF of the Transvaal Supergroup, South Africa: implications for the origin of BIF and the history of atmospheric oxygen
- Oonk, Paul Bernardus Hendrikus
- Authors: Oonk, Paul Bernardus Hendrikus
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/50721 , vital:26021
- Description: Banded iron formations (BIF), deposited prior to and concurrent with the Great Oxidation Event (GOE) at ca. 2.4 Ga, record changes in oceanic and atmospheric chemistry during this critical time interval. Four previously unstudied drill-cores from the Griqualand West Basin, South Africa, capturing the rhythmically mesobanded, deep-water Kuruman BIF and the overlying granular, shallower Griquatown BIF, were sampled every ca. 10 m along core depth. Mineralogically, these BIFs consist of three iron-bearing fractions: (1) Fe-Ca-Mg-Mn carbonates, (2) magnetite with/without minor hematite and (3) Fe-silicates. These fractions are typically fine-grained on a sub-μm scale and their co-occurrence in varying amounts means that bulk-rock or microanalytical geochemical and stable isotope data are influenced by mineralogy.
- Full Text:
- Date Issued: 2017
- Authors: Oonk, Paul Bernardus Hendrikus
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/50721 , vital:26021
- Description: Banded iron formations (BIF), deposited prior to and concurrent with the Great Oxidation Event (GOE) at ca. 2.4 Ga, record changes in oceanic and atmospheric chemistry during this critical time interval. Four previously unstudied drill-cores from the Griqualand West Basin, South Africa, capturing the rhythmically mesobanded, deep-water Kuruman BIF and the overlying granular, shallower Griquatown BIF, were sampled every ca. 10 m along core depth. Mineralogically, these BIFs consist of three iron-bearing fractions: (1) Fe-Ca-Mg-Mn carbonates, (2) magnetite with/without minor hematite and (3) Fe-silicates. These fractions are typically fine-grained on a sub-μm scale and their co-occurrence in varying amounts means that bulk-rock or microanalytical geochemical and stable isotope data are influenced by mineralogy.
- Full Text:
- Date Issued: 2017
Intimate strangers: encountering the foreign in urban spaces
- Authors: Seshoka, Thabo Jerry
- Date: 2017
- Subjects: Urbanization -- South Africa -- Port Elizabeth -- History , Cities and towns -- South Africa -- Port Elizabeth -- History Architecture -- South Africa -- Port Elizabeth Cultural property -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/13746 , vital:27304
- Description: The year 2015 marked a significant year in South African History and it ignited a deep desire in the hearts of locals in Port Elizabeth, Nelson Mandela Bay Metropolitan to question and engage with the city’s ambivalent heritage landscape and heritage discourse. The year 2015 was the year in which the country witnessed the rise community movements that called for the removal of Victorian and Apartheid era heritages across the country. The year also saw a rise in violent service delivery protests and a rise in the amount of xenophobic attacks across the county, including Port Elizabeth. In this thesis, positioned within the field of heritage studies (Anthropology) and employing the concept of the ubuhlanti (Kraal) as a tool to understand the former within a heritage framework. The thesis unpacks and demonstrate how the city centre of Port Elizabeth can be likened to the concept of the ubuhlanti. The ubuhlanti: an intimate community space, which has the potential to double up as an exclusionary space, excluding those who do not possess the necessary social capital to enter its centre.
- Full Text:
- Date Issued: 2017
- Authors: Seshoka, Thabo Jerry
- Date: 2017
- Subjects: Urbanization -- South Africa -- Port Elizabeth -- History , Cities and towns -- South Africa -- Port Elizabeth -- History Architecture -- South Africa -- Port Elizabeth Cultural property -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/13746 , vital:27304
- Description: The year 2015 marked a significant year in South African History and it ignited a deep desire in the hearts of locals in Port Elizabeth, Nelson Mandela Bay Metropolitan to question and engage with the city’s ambivalent heritage landscape and heritage discourse. The year 2015 was the year in which the country witnessed the rise community movements that called for the removal of Victorian and Apartheid era heritages across the country. The year also saw a rise in violent service delivery protests and a rise in the amount of xenophobic attacks across the county, including Port Elizabeth. In this thesis, positioned within the field of heritage studies (Anthropology) and employing the concept of the ubuhlanti (Kraal) as a tool to understand the former within a heritage framework. The thesis unpacks and demonstrate how the city centre of Port Elizabeth can be likened to the concept of the ubuhlanti. The ubuhlanti: an intimate community space, which has the potential to double up as an exclusionary space, excluding those who do not possess the necessary social capital to enter its centre.
- Full Text:
- Date Issued: 2017
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