Stratigraphy and base metal mineralization in the Otavi Mountain Land, Northern Namibia—a review and regional interpretation

Kamona, A.F.; Günzel, A.

doi:10.1016/j.gr.2006.04.014

Cited by 40 publications

(34 citation statements)

References 29 publications

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“…In the Appalachian district the ores are associated with karst breccias or reefs in dolomitic limestone at or adjacent to a dolomitelimestone interface (Hoagland, 1976). The widespread regional distribution of MVT deposits is also observed in other districts, including the Otavi Mountainland in Namibia where regional scale ore fluid migration is indicated by the presence of Pb-Zn occurrences over 2500 km 2 within stratabound breccias of the Elandshoek Formation (Kamona & Günzel, 2007) as well as in central Africa (Fig. 6) where numerous prospects are associated with a few Neoproterozoic economic deposits such as Tsumeb, Kipushi, Kabwe and Berg Aukas (Kamona & Friedrich, 2007;Kampunzu et al, 2009).…”

Section: Mvt Depositsmentioning

confidence: 91%

“…Tonnage and grade data for 23 MVT deposits ( Fig. 7) from Canada (Paradis et al, 2007) and Africa (Kamona & Günzel, 2007;Kamona & Friedrich, 2007;Kampunzu et al, 2009) indicate that the average MVT deposit contains 13 Mt with grades of 7.2 wt. % Zn and 3.4 wt.…”

Section: Mvt Depositsmentioning

confidence: 99%

“…The sulphide assemblages in the latter ores are composed of variable amounts of galena, tennantite, chalcopyrite, sphalerite, chalcocite, enargite, bornite, pyrite, minor germanite, reniérite, briartite, Ge-bearing colusite, and Mo-W sulphides (e.g. Melcher et al, 2006;Kamona & Günzel, 2007).…”

Section: Mvt Depositsmentioning

confidence: 99%

“…In southern and central Africa, the sulphur isotopes of MVT deposits fall into three categories: (1) heavy and homogeneous δ 34 S values (e.g. Tsumeb δ 34 S = 20.5 ‰, n= 35; Kamona & Günzel (2007)), (2) highly variable with a wide range of values (e.g. Kombat δ 34 S = −11.3‰ to +26.2‰ with an average value of +5.2‰, n=19; Hughes (1987)) and (3) negative and homogeneous δ 34 S values (e.g.…”

Section: Mvt Depositsmentioning

confidence: 99%

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Carbonate-Hosted Base Metal Deposits

Kamona¹

2011

Earth and Environmental Sciences

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Section: Mvt Depositsmentioning

confidence: 91%

Section: Mvt Depositsmentioning

confidence: 99%

Section: Mvt Depositsmentioning

confidence: 99%

Section: Mvt Depositsmentioning

confidence: 99%

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Carbonate-Hosted Base Metal Deposits

Kamona¹

2011

Earth and Environmental Sciences

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“…The occurrence of stromatolites in SW Angola was firstly reported by Vasconcelos [64], who related those microbial structures to the form-genus Collenia, ranging from types resembling C. undosa, Walcott, to more complex forms, and who highlighted its probable correlation with those of Otavi in the adjacent territory of southwest Africa. More recently, several authors have reinforced the correlation between the Leba Formation and the Tchamalindi Formation (Angola) and the Tsumeband Subgroup and Otavi Group outcropping in Namibia [35,58,65], possibly Vendian in age [66,67].…”

Section: Iconographic Contentmentioning

confidence: 99%

Community Involvement in Geoconservation: A Conceptual Approach Based on the Geoheritage of South Angola

Tavares

Henriques

Domingos³

et al. 2015

Sustainability

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Abstract:In this work, it is argued that effective protection of geological objects displaying heritage value requires the local community's involvement in all geoconservation actions, i.e., inventory, evaluation, conservation, valuation and monitoring procedures, and not only at the final part of the process, when it is expected from local communities that the physical integrity of such objects is guaranteed. Community involvement in geoheritage inventory and evaluation procedures can be appraised by using a classification system that integrates both the geoheritage properties displayed by the geological objects and usually recognized by geoscientists (i.e., relevance grade) and the social role attributed to geological objects by communities outside Earth scientists that arise from the public perception of such objects (i.e., abstract perceptiveness). Using two case studies from southern Angola (Huíla Province) where both social and scientific OPEN ACCESSSustainability 2015, 7 4894 components were taken into account in geoheritage evaluation procedures (Tundavala and Leba geosites), we propose a conceptual community-based model, which can be applicable to geoconservation purposes and actions in other African regions and converging with the main goals of the "African Alive Corridors" initiative.

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Vegetation state changes in the course of shrub encroachment in an African savanna since about 1850 CE and their potential drivers

Tabares

Zimmermann

Dietze

et al. 2019

Ecology and Evolution

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1. Shrub encroachment has far-reaching ecological and economic consequences in many ecosystems worldwide. Yet, compositional changes associated with shrub encroachment are often overlooked despite having important effects on ecosystem functioning.2. We document the compositional change and potential drivers for a northern Namibian Combretum woodland transitioning into a Terminalia shrubland. We use a multiproxy record (pollen, sedimentary ancient DNA, biomarkers, compoundspecific carbon (δ 13 C) and deuterium (δD) isotopes, bulk carbon isotopes (δ 13 Corg), grain size, geochemical properties) from Lake Otjikoto at high taxonomical and temporal resolution.3. We provide evidence that state changes in semiarid environments may occur on a scale of one century and that transitions between stable states can span around 80 years and are characterized by a unique vegetation composition. We demonstrate that the current grass/woody ratio is exceptional for the last 170 years, as supported by n-alkane distributions and the δ 13 C and δ 13 Corg records. Comparing vegetation records to environmental proxy data and census data, we infer a complex network of global and local drivers of vegetation change. While our δD record suggests physiological adaptations of woody species to higher atmospheric pCO 2 concentration and drought, our vegetation records reflect the impact of broadscale logging for the mining industry, and the macrocharcoal record suggests a decrease in fire activity associated with the intensification of farming. Impact of selective grazing is reflected by changes in abundance and taxonomical composition of grasses and by an increase of nonpalatable and trampling-resistant taxa.In addition, grain-size and spore records suggest changes in the erodibility of soils because of reduced grass cover. | 963TABARES ET Al.

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Stratigraphy and base metal mineralization in the Otavi Mountain Land, Northern Namibia—a review and regional interpretation

Cited by 40 publications

References 29 publications

Carbonate-Hosted Base Metal Deposits

Carbonate-Hosted Base Metal Deposits

Community Involvement in Geoconservation: A Conceptual Approach Based on the Geoheritage of South Angola

Vegetation state changes in the course of shrub encroachment in an African savanna since about 1850 CE and their potential drivers

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