Geologic evolution of the barberton greenstone belt. Pdf geology and tectonostratigraphy of the onverwacht suite. Early workers regarded the belt as a 22 km thick continuous volcanosedimentary sequence and considered deformation to be a consequence of gravitational infolding of denser greenstones between rising diapirs of the. Porphyryepithermal auagmo ore formation by vaporlike fluids. The moodies group, the uppermost unit in the barberton greenstone belt bgb in south africa, is a 3. Record of midarchaean subduction from metamorphism in the. Syntheses of the geology of major areas of the earths crust are increasingly needed in order that the features of, and the problems associated with, the secular evolution of the continents can be understood by a wide audience. Tsodilo resources limited awarded gold and silver prospecting right in the barberton greenstone belt, south africa toronto, ontario fscwire tsodilo resources limited tsxv. Archean spherule layers in the barberton greenstone belt 35 figure 1. The nonglacial and noncratonic origin of an early archean. The barberton greenstone belt in south africa is one of the bestpreserved successions of midarchean ga supracrustal rocks in the world, together. I put together a series of cartoons on a long and boring flight to illustrate this process. The property represents the bestpreserved succession of volcanic and sedimentary rock dating back 3.
All structured data from the file and property namespaces is available under the creative commons cc0 license. Pre 16 geology of the barberton greenstone belt processes of. The barberton greenstone belt bgb is located in the kapvaal craton of southeastern africa. Greenstone belt, straddling the south africa swaziland border, offers profound insights on archean processes and events that shaped the evolution of the crust of our planet. This implies a tectonic setting comparable to some modern orogenic belts and that the granitegreenstone terrane investigated in this study possibly represents an exhumed mid to lowercrustal terrane that formed a basement to the barberton greenstone belt at the time of the peak metamorphic event at ca.
This type of granite is visually responsible for the formation of the arcuate greenstone tongues, like tne jamestown schist belt, which form such a striking feature of greenstone belts. This belt has provided an exceptional geological portal for observing the complex geological environments on the early earth. The evidence in this case comes from signs of high pressure, low temperature metamorphism 3. The paleoarchean barberton greenstone belt bgb of south africa comprises some of the worlds best preserved c. The approximately 35503200 ma barberton greenstone belt in south africa is regarded as one of the best preserved, early archaean supracrustal sequences on earth. Mineralization of greenstone and mesothermal deposits. Jul 01, 2019 the barberton greenstone belt is one of the oldest and best exposed archaean greenstone belts on earth. The greenstone belt consists of a sequence of mafic to ultramafic lavas and metasedimentary rocks emplaced and deposited between 3. Tectonic evolution of the barberton greenstone belt. Please note that given the exceptional circumstances related to the coronavirus covid19 pandemic, regular mail sent to the world heritage centre in paris cannot be processed on a normal basis for the moment. The asteraceae has the most representatives and its largest genera are senecio, helichrysum and berklleya. It characterizes one of the most wellpreserved and oldest pieces of continental crust today by containing rocks in the barberton granite greenstone terrain 3. Geologic evolution of the barberton greenstone belt and vicinity. This implies a tectonic setting comparable to some modern orogenic belts and that the granite greenstone terrane investigated in this study possibly represents an exhumed mid to lowercrustal terrane that formed a basement to the barberton greenstone belt at the time of the peak metamorphic event at ca.
Fscwire tsodilo resources limited awarded gold and. This is one of our best specimens that came from the barberton greenstone belt, makhonjwa mountains south africa, south africa. Barberton greenstone belt pdf recent field and geochemical studies indicate a need to test the stratigraphy of the ca. Pdf tectonic history of the barberton greenstone belt. So you can see how structure pays the pivotal role in the development greenstone belt shear zone hosted gold deposit. Christoph heubeck presented the geology of the central bgb along the transect of the r40, a scenic paved road across the range from barberton to the josefsdalbulembu border post.
Here we describe a sedimentary layer, termed the green sandstone bed, dated at ca. As such, it is a remarkable natural laboratory where conditions and processes at the surface of the archean earth can be studied in detail. Jun 19, 2019 barberton greenstone belt pdf recent field and geochemical studies indicate a need to test the stratigraphy of the ca. This file is licensed under the creative commons attributionshare alike 3. The barberton greenstone belt consists of a sequence of mafic to ultramafic lavas and metasedimentary rocks emplaced and deposited between 3. Cherts of the barberton greenstone belt, south africa. Geology and tectonostratigraphy of the onverwacht suite, barberton greenstone belt, south africa. Geologic evolution of the barberton greenstone belt, south africa volume 329 of geological society of america special paper volume 329 of geological society of america special papers issue 329 of special papersgeological society of america series volume 329 of special papers. The area embraces one of the most complexly deformed and highly meta morphosed regions in the early precambrian barberton greenstone belt. These developments and the recent discovery of a nickelsulphide deposit associated with an old talc mine suggest that mining activities in the barberton greenstone belt are set to continue well into the foreseeable future. Simplified geologic map of the barberton greenstone.
This is a pdf file of an unedited manuscript that has been accepted for. Depositional and tectonic setting of the archean moodies. The principal episodes of the geotectonic history of the barberton greenstone belt span some ma from the initial submarine eruption of the onverwacht laves. May 08, 2020 jawshan kabir pdf reflections on dua jawshan kabir. This shear zone system is developed in metaturbiditic. Geologic evolution of the barberton greenstone belt, south africa. A brief account of the history and mining associated with the early discovery of gold in the area is outlined and a fairly comprehen. Pdf cherts of the barberton greenstone belt, south africa. Geologic evolution of the barberton greenstone belt, south africa authors.
Implications of in situ calcification for photosynthesis. Ga barberton greenstone belt as it is presently adopted. Ga barberton greenstone belt as it is presently adopted 1,2. The barberton greenstone belt is one of the oldest and best exposed archaean greenstone belts on earth. Simplified geologic map of the barberton greenstone belt. Ppt archean greenstone belt powerpoint presentation. Apr 15, 2015 the barberton greenstone belt in south africa is one of the bestpreserved successions of midarchean 3. Dec 05, 2019 barberton greenstone belt pdf recent field and geochemical studies indicate a need to test the stratigraphy of the ca. Structural controls on gold mineralisation in the central. Sep 04, 2016 sawed and polished rock slabs of typical barberton greenstone belt rock types on display at the group accommodation for closeup study and photographing. Sawed and polished rock slabs of typical barberton greenstone belt rock types on display at the group accommodation for closeup study and photographing.
An evaluation of the metamorphic history of selected areas of the barberton greenstone belt and greenstone remnants in the adjacent granitic terrane including the schapenburg schist belt and greenstone remnants surrounding the boesmanskop syenite pluton in. Pre 16 geology of the barberton greenstone belt processes. Stratigraphy of south africa download ebook pdf, epub. Pdf cherts of the barberton greenstone belt, south.
It is preserved in structurally separate blocks in. Recent field and geochemical studies indicate a need to test the stratigraphy of the ca. Pt constraints on the metamorphic evolution of the. Pdf studies investigating the structure and diversity of earths record of life older than 3. Archean accretion and crustal evolution of the kalahari. Tectonic history of the barberton greenstone belt, south africa wiley.
The only data presented so far are from some komatiites and tonalitetrondhjemitegranodiorite ttg gneiss samples from the barberton greenstone belt gruau et al. The detailed morphologies of these are more complex, as demonstrated by their appearance in figure 2. Jul 08, 2019 barberton greenstone belt pdf recent field and geochemical studies indicate a need to test the stratigraphy of the ca. Barberton greenstone belt and the surrounding granitoids are listed in. This is a simplified geologic map of the barberton greenstone belt, south africa, showing three of the major groups and their interactions as well as the kaap valley craton. Simplified lithostratigraphic map of the central lapland greenstone belt afer lehtonen et al 1998, showing the location of the gold prospects included in this work and major fault zones. The barberton greenstone belt in south africa is one of the bestpreserved successions of midarchean 3. And it make sense for me to talk a little bit more about how greenstone belts form and how this controls the mineralization. Schindlbeck shows that such type of volcanism can also be common at ocean islands. The multiple sulfur isotopic composition of pyrite of moodies intervals was newly obtained to examine the influence of these depositional settings on the sulfur isotope. Several recent studies have shown that small mountainous rivers smrs deliver a disproportionate quantity of solutes i.
Christoph heubeck, gary byerly and don lowe due to its excellent exposure, low grade metamorphic overprint and considerable extent the barberton greenstone belt, straddling the south africa swaziland border, offers profound insights on archean. Barberton greenstone belt contains 1600 cubic km source rock. The central parts consist mostly of lowgrade maficultramafic rock units preserved as the onverwacht group of the barberton supergroup brandl et al. Fscwire tsodilo resources limited awarded gold and silver. Feb 28, 2019 this data is associated with the following publication. Geological map of the western part of the barberton greenstone belt and immediately surrounding granitic terrane, showing the distribution of spherule layers s1 and s3 of the northern areas modified from kamo and davis, 1994. This work uses the ion microprobe shrimp, to attempt such a test. All structured data from the file and property namespaces is. Oreshoot formation in the main reef complex of the. Tectonic history of the barberton greenstone belt, south africa. Tsd tsodilo or the company is pleased to announce that effective april 7, 2016, the granting of prospecting right mp3051210471 has been perfected and. Tectonic evolution of the barberton greenstone belt wikipedia. Geologic evolution of the barberton greenstone belt, south. These data, although valuable, allow only a limited interpretation.
This study area is important since it represents, at 3. Tsodilo resources limited awarded gold and silver prospecting right in the barberton greenstone belt, south africa. Department of geological and environmental sciences, stanford university, stanford, california 94305. The multiple sulfur isotopic composition of pyrite of moodies intervals was newly obtained to examine the influence of these depositional settings on the sulfur isotope record. Isua greenstone belt greenland the isua greenstone belt is an archean greenstone belt in sw greenland dated at 3. The aim of the project is to investigate conditions on the early earth in which life emerged and evolved by i sedimentological and geochemical investigations. Barberton makhonjwa mountains unesco world heritage centre. The bgb is a small, cuspshaped succession of volcanic and sedimentary rocks, surrounded on all sides by.
It is preserved in structurally separate blocks in a heavily deformed foldandthrust belt. The barberton greenstone belt serpentines approximately 620 serpentinetoleranttaxa species level and below of 298 genera and seventy four plant families grow on serpentine in the barberton greenstone belt. Gold production in fairview mine in the barberton greenstone belt, south africa, is focused on highgrade, steeply plunging ore shoots contained within a gently undulating system of spaced, lowdisplacement, broadly beddingparallel faults, and shear zones, collectively referred to as the main reef complex. Almost all the rocks are deformed and substantially altered by. Barberton greenstone makhonjwa mountains south africa with. International institute for islamic studies, qom, iran spiritual quest summer and autumn vol.
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