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| GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |
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| are from Namibia, South Africa, Zimbabwe, and Tanzania. All the fluorescent images were taken using a...Blue willemite and white dolomite, 6.5 cm, Tsumeb mine. The blue willemite fluoresces bright yellow, and...the UV source; Tsumeb mine. Field of view is 2.2 cm. Figure 3. The Skorpion mine is located close to the...with permission Figure 4. The Okorusu fluorite mine in Namibia was arguably the source of the country’s...country’s finest fluorite specimens. Over the years the mine produced a plethora of multicolored, often-zoned |
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| at 11:53 03 August 2012 Chondrodite TILLY FOSTER MINE, BREWSTER AREA PUTNAM COUNTY, NEW YORK F ew minerals...chondrodite specimens from the Tilly Foster iron mine, Putnam County, New York, can be seen in many American...rounded crystals to 1.5 cm; the old Cleveland iron mine at New Marlborough and at Becket, Great Barrington...Tilly Foster mine, 10 kilometers northwest of Brewster, Putnam County, New York. This mine, which was opened...chondrodite specimens from the historic Tilly Foster iron mine near Brewster, New York. The 8.2-cm-high specimen |
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| gemological wealth of East Africa. This unique region encompasses ·what may be the world's richest gem...gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical splendor...200 known here-holds the productive Mwadui diamond mine, known for Yeryfine, rare, pink diamonds. Emerald...chrome tourmaline are widely identified with the region. ( continuedon backflap) ♦ ♦ ♦ ♦ ♦ ~...~OSCIENCE 'l'RESS, INC. TbPattiFor sunrises over Lake Turkana, champagne in the Serengeti, and Norfolk |
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| it collected when the Tsumeb Mine (as well as other mines of the region) were still in production in...engineering work took him to the Tsumeb Mine in Namibia. This mine is renowned for producing what are arguably...MINERALS 57001 Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the Tsumeb Mine were |
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| results obtained from vitrinite reflectance and apatite fission-track data. The map also reveals substantial...test existing denudation magnitudes obtained from apatite fission-track (AFT) analysis and vitrinite reflectance...section denuded from a broad region centred on the present English Lake District and contiguous Irish...Iceland Plume, a mantle upwelling that affected a region of the North Atlantic continents of 1000km width...through (1) extensive volcanism of the North Atlantic region (White & McKenzie 1989) and (2) basaltic underplating |
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| not undergone significant tectonic shortening. Apatite fission-track analyses confirm that exhumation...sediment compaction (for example, Hedberg, 1936; Magara, 1980), porositydepth trends in well data can be...shale-compaction trends for estimating erosion (for example, Magara, 1976; Issler, 1992; Nelson and Bird, 2005). Numerous...Kugrua 1 Kuparuk Uplands (Ekvik) Kuukpik 3 Kuyanak 1 Lake 79 Federal 1 Little Twist Long Island 1 Lupine Unit...R., 1992, Thermal history reconstruction using apatite fission track analysis and vitrinite reflectance; |
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| determinants such as vitrinite reflectance and apatite fission track analysis (AFTATM). The interpretation...structural and hydrocarbon generation histories of a region. We propose that the key to recognizing the thermal...of techniques, the principal among them being apatite fission track analysis (AFTA TM) and vitrinite...detrital apatite grains. Fission tracks are linear zones of radiation damage within the apatite crystal...determination of fission track ages on individual apatite grains. The lengths of confined tracks contain |
 | Song, Xu, Lü, Xiuxiang, Quan, Han, Zhou, Xiaoxiao, Guan, Yao, Feng, Xinluo (2020) Recovery of the Cretaceous palaeo‐uplifts and its implications for hydrocarbon systems in the Kuqa Depression, Tarim Basin, western China. Geological Journal, 55 (12). 7872-7891 doi:10.1002/gj.3905 | Journal (article/letter/editorial) |
| results of cyclic analysis and thermal simulation of apatite fission track (AFT), the stratum denudation amount...Palaeogene–Early Neogene (ca. 20 Ma). KEYWORDS apatite fission track, Kuqa, Milankovitch, palaeo-uplifts...seismic reflection characteristics (Figure 2).The Magara, 1976), but these data are not precise enough for...and Cretaceous, Cretaceous and Palaeogene, by apatite fission track (AFT) (Glorie & De Grave, 2016; Wang...Yanshan movement caused a regional uplift used the apatite U/(Th–He) method to analyse the uplift and exhuma- |
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| exhumation. The analysis of sonic velocities, apatite fission tracks, vitrinite reflectance, normalized...1993; Hillis et al. 1994; Hillis in press); • apatite fission track analysis (e.g. Green 1989; Lewis...with respect to their present burial-depth (e.g. Magara 1976; Lang 1978; Bulat & Stoker 1987; Hillis 1991;...relationships (e.g. J ankowsky 1962; Marie ! 975; Magara 1976; Lang 1978; Cope 1986; Wells 1990; Issler...because changes in their compaction state across the region are unlikely to be due to facies/lithology variation |
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| structures have been described in the Wessex Basin (Lake & Karner 1987), the Brittany and South-West Channel...burial-depth (i.e. they are overcompacted (e.g. Magara 1976; Lang 1978; Bulat & Stoker 1987). For a given...mean interval transit time for the unit across the region are unlikely to be faciesrelated. Finally, given...other detailed published studies of this region using apatite fission track analysis, vitrinite reflectance...Midlands Shelf have given good correlation with apatite fission track analyses (see also Hillis this volume) |
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| determine the thickness of removed sediments (e.g. Magara 1976; D o w 1977; Majorowicz et al. 1990). The...Burnham 1990); (ii) AFT: kinetic modelling of apatite fission track data (e.g. Willett 1992); (iii) B...(Barker & Pawlewicz 1994). Where available, VR and apatite fission track (AFT) data have been used in c o...of the geothermal gradient beyond the limit of apatite fission track analysis (i.e. >110 ~ In our study...palaeogeothermal gradient, palaeotemperatures from VR and apatite fission track data. ature gradient history. The |
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| compared to equivalent estimates from AFTA/VR (apatite fission track/ vitrinite reflectance) palaeotemperature...porosity with depth has been shown to be logarithmic (Magara 1976), a linear relationship between interval velocity...lithologies within wells for the collection of apatite samples (commonly restricted to Bridport Sandstone...Clay. Marine and Petroleum Geology, 11, 283-293. MAGARA, K. 1976. Thickness of removed sedimentary rocks |
 | Yu, Qiang, Ren, Zhanli, Li, Rongxi, Wang, Baojiang, Qin, Xiaoli, Tao, Ni (2017) Paleogeotemperature and maturity evolutionary history of the source rocks in the Ordos Basin. Geological Journal, 52. 97-118 doi:10.1002/gj.3069 | Journal (article/letter/editorial) |
| higher than since 23 Ma was determined based on apatite fission track data (Ren, FIGURE 1 Division and...sub‐facies and delta front sub‐facies. The center of the lake is mainly overlaid by Mesozoic strata in a conformity...Qingcheng, Huangling, and Xunyi, even 0 m in local region. In Jingbian, become much thinner to the boundaries...He & Wang, 1989), the acoustic logging method (Magara, this paper are consistent with the data made...the basin continuously uplifted, the crust The apatite fission track data only record the paleogeotemperature |
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| subsurface and compaction data from the Gulf Coast (Magara 1975) seem to demonstrate the possible presence...earlier considerations by Momper (1978) and Honda & Magara (1982) who claimed that petroleum migration in...be either vertical or horizontal: according to Magara (1980), in relatively young sedimentary basins...from sonic logs with hydrocarbon extract data, Magara (1980) was able to provide evidence for intervals...under subsurface conditions (Hunt 1979; Honda & Magara 1982; Mann 1989): structural water within certain |
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| Mineralogy and paragenesis at the Mount Wellington Mine (Abstract). By Y.A. Kettaneh and J.P.N. Badham....Wellington Mine (Abstract): by Y.A. Kettaneh and J.P.N. Badham The Mount Wellington Mine lies some 7...of the Carnmarth and Carnmenellis granites. The mine, which is on the westerly extension of the Wheal...rare and it is necessary to rely on material from mine dumps in many cases. 2. Mineralogy Cassiterite is...Kelly Mine (SX 794 817) and forming pseudomorphs after pyrite at a site near Golden Dagger Mine (SX 679 |
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| Elsevier Science Publishers B.V., Amsterdam [PD] Apatite fission-track analysis of Oligocene strata in South...October 14, 1992) ABSTRACT Corrigan, J.D., 1993. Apatite fission-track analysis of Oligocene strata in South...(Isot. Geosci. Sect. ), 104: 227-249. Analysis of apatite fission-track data from forty-seven surface and...heating. Data from outcrop samples document that the apatite component was derived from source areas characterized...120 ° to 50°C during the early Tertiary,. The apatite population is characterized by a log-normal chlorine |
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| 49 88 Yuita et al., 1982 Yuita, 1983 Country Region Min Max Japan Basin of the Nagara River The...Ukraine Canada Canada New Zealand Igneous rocks Apatite Biotite Donbas Alberta, oil sand and deposit 0...Graben Volcanic rock Russia Carbonatitic rocks Tanzania Oldoinyo Lengai Silicate rocks Fumarole Felsic...Prairie Metamorphic rocks Scapolite China Daftar Tanzania Morogoro Norway Ødegårdens Verk a SD-Standard...SW e surface waters. (mg/L). Country Australia Region Type of water, intake, water bodies GW SW China |
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| Sedimentation and Palaeoceanography of the North Atlantic Region, Geological Society Special Publication No. 90...anticline and associated short-cut fault in the region of the Wick-Great Glen Fault intersection. BCRT...sediment compaction, vitrinite reflectance and apatite fission tracks all suggest that the IMF was subject...with respect to their present burial depth (e.g. Magara 1976; Lang 1978; Bulat & Stoker 1987). The amount...results are consistent with both the compaction and apatite fission track analyses and conse- Downloaded |
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| cement includes aggregates of apparently spherical apatite (A) in addition to radially fibrous calcite (C)...wood and zone 1 co-precipitated. Microspherulitic apatite occasionally occurs in zone 1 cement (Fig. 8C)...to show how the proportion of cryptocrystalline apatite varies Cementtype Wood cement Largermicrofracture...DIAGENESIS (a) Sub-oxic zone Apatite precipitation Microspherulitic apatite, such as occurs in zone 1 cement...8q, has been attributed to bacterially mediated apatite formation (Prevot & Lucas, 1986). Phosphate tied |
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| undercompaction (Hottmann and Johnson, 1965; Herring, 1973; Magara, 1978; Chapman, 1983; Bulat and Stoker, 1987; Marsden...uniform sedimentary units extend over much of the region; in particular the lower Cenozoic shales and the...palaeo-temperature data (vitrinite reflectance, VR, and apatite fission-track analysis, AFTA, data). 2. Normal velocity-depth...Campanian–Danian marine shale, Shetland Group, Faroe-Shetland region (Tassone et al., 2014b). 4: AptianAlbian marine...increasing with time (Hubbert and Rubey, 1959; Magara, 1978). If a rock is shifted to a greater depth |
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| distal, somewhat shallower, deposits of the western region of the state eastward to more proximal and more...strata of the Canadaway and West Falls groups of the Lake Erie District (Figs 1 and 2). Our transect trends...Finger Lakes District to the unfolded foreland of the Lake Erie District. In sampling for joint development... Fig. 1. Location map of the study areas in the Lake Erie and Finger Lakes districts. Approximate direction...the Dunkirk Shale of the Canadaway Group in the Lake Erie District had roughly 0.6-0.7 km of overburden |
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| concentrations in groundwaters associated with the Lake Saint-Martin impact structure, Manitoba Alexandre...the Geological Survey of Canada in the Lake Saint-Martin region of Manitoba have confirmed earlier reports...water limit of 1.5 mg/L are from wells within the Lake Saint-Martin impact structure, a 208 Ma complex...B concentrations observed in groundwaters of the Lake Saint-Martin area represent the geochemical signature...essential constituent. However, F is also found in apatite, biotite, illite and amphibole group minerals where |
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| emerald occurrences (geographic situation) in the region ChivorlSomondoco-GachahL Chivor/Somondoco-Gachalâ...not only for samples coming from the same mining region, but also for the (mean) concentrations in emeralds...a certain mining field or a certain geographic region. our With regard to to magnesium and and sodium...MgO) were observed in the the emeralds the mining region of Gachahi. Gachalâ. The The highest from the 1%...participation of the he evaporites present in the whole region) are more »re than probable locally restricted |
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| Private Reports to ECA (5) V. KOVENKO - Balya Lead Mine-MTA Year Book-1940 (6) z. SANLAV - Private Correspondence...from Balya, and by others that operation of the mine began during the Age of Pericles. A t any rate,...I and the Greek invasion of the early 1920's the mine was operated until 1938 when high operating costs...and equipment were later moved to the Keban lead mine in Ela.zig. It is esti mated that from the end...ac companies dacite-liparite and appears in the region of big tectonic fractu res and cross-faulting |
