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| and MagnesiumChloridein CretaceousBasins of Sergipe,Brazil N. C. WA•t.AW Abstract Tachyhydrite(CaC12-2MgC12'12H20)...Lower Cretaceous(Aptian) evaporitesequences of Sergipe,Brazil, andhasalsobeenreportedin Aptian evaporitesof...Cretaceousevaporitesof the coastalstrips of eastern Brazil and of west Africa could have formed in a structural...provides a present-daymodel. The coastalevaporitesof Brazil and West Africa lack basalsulfatedeposits.It is...Sergipedeposits, Br in halite (av. 360 ppm) andin carnallite(av. 4,728ppm) are within and abovethe range for |
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| disconnected salt lakes. In contrast, at least in the Sergipe embayment of the Cretaceous South Atlantic salt...salt flats are characterizedby a wide array of carnallite tachyhydrite facies. These differencesreflect...fortunate that this is not true of the Brazilian Sergipe conditions,evaporitesare amongthe best indicators...Amazon Basin is a larg,e Paleozoicbasin in northern Brazil containinga thick sequenceof an- hydriteand rock...brine off the Amazon Basin from the Pacific. Sergipe The colorfulhypersalineevaporitesequence of Serdid |
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| Universidade Federal Fluminense, Niteroi, Rio de Janeiro, Brazil c Department of Geology and Geological Engineering...Cretaceous (Aptian, 121.0–112.2 Ma) of the Sergipe basin, Brazil and the Congo basin, Republic of the Congo...explain the ‘‘anomalous’’ Cretaceous evaporites from Brazil, Congo, and Thailand that contain the extremely...Cretaceous (Aptian, 121.0–112.2 Ma) of the Sergipe basin, Brazil and Congo basin, and the Early to Late Cretaceous...Anhydrite Halite Polyhalite Kieserite Sylvite Carnallite Tachyhydrite Bischofite CaCO3 CaCO3 CaMg(CO3)2 |
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| is a major primary mineral in virtually all carnallite sequences of Cretaceous age. The author explains...of tachyhydrite. The tachyhydrite bodies in the Sergipe-Alagoas basin are related to the Ibura evaporite...structures occur in the coastal region of East Brazil [9]. Tachyhydrite CaCl2.2MgCl2·12H2O is an ex...Stassfurt beds as thin and impersistent bands in carnallite rock or filling fractures in clays. In the opinion...of alternating halite and carnallite beds. There are four or five carnallite beds with thicknesses up |
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| deposition occurred first in the Sergipe-Alagoas Basin of NE Brazil at c. 124.8 Ma, and was closely followed...times (Sobreira & Szatmari 2000) (Fig. 2). The Sergipe-Alagoas Basin is separated from the Camamu Basin...not been penetrated in the deeper part of the Sergipe-Alagoas Basin ( > 1000 m) and seismic data also...near the ocean-continent crustal boundary. The Sergipe-Alagoas Basin is bounded to the north by the Ascension...also been recognized in the Barreirinhas Basin of Brazil (Azevedo 1991) and in the interior Araripe Basin |
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| anhydrite nodules. In the potash zone, neither carnallite nor sylvite shows structures that may indicate...floor. Moreover, it is discernible at places that carnallite and sylvite were formed interstitially in the...are missing, particularly around the margins. Carnallite, sylvite and tachyhydrite are present locally...capital city of Laos, and shortly thereafter, carnallite as well as sylvite were found on the Thai side...alteration product of the former carnallite. The idea of salt flowage and carnallite-sylvite conversion was further |
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| and 7H2O), potassium chloride, and some part of carnallite, the field of which is markedly enlarged. Fields...during various geological epochs. Sylvite and carnallite are the most abundant potassic minerals precipitated...polyhalite) or only anhydrite assemblages occur with carnallite. Nevertheless, the spatiotemporal distribution...sediments were deposited in four (Gabon– Angola, Sergipe–Alagoas, Korat, and Sakon–Nakon) basins (Fig. 1)...abundant and largely represented by sylvite and carnallite. These minerals are present in all Phanerozoic |
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| Rio de Janeiro, Brazil 2 Cenpes, Petrobras, Rio de Janeiro, Rio de Janeiro, Brazil *Corresponding author...fields: Azeri, Chirag and Guneshli. The offshore Brazil hydrocarbon discoveries Tupi and Iara (pre-salt...Caucasus) Iran India Russia (East Siberia) Iran China Brazil Shah Deniz Niban Kashagan Tabnak Severnyi Yadavaran...1) are the largest discoveries in offshore 133 Brazil in the past decade, with reserves exceeding 5 and...through geological time. The Parecis Basin in central Brazil Fig. 2. GeoSat topobathymetry for North and South |
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| Potash___________________________________________________ Sergipe rock salts______________________________________...encouraging. In the eastern part of Routh America, Brazil and Venezuela both mine phosphorites from marine...for developing further ore reserves. In addition, Brazil also has large igneou:-:; apatite deposits, ~ome...those of Brazil may be found in Argentina. A possible major source of potash salts in Brazil is being...being explored in Sergipe Province in northeast Brazil. Available sulfur in the eastern part of South America |
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| CaCO, polyhalite 2CaSO.·MgSO..K2SO.. 2H2O carnallite MgCIoKCl'6H2O rinneite FeCI2'NaCl'3KCl dolomite...polyhalitc, blocdite, kainite, halite, sylvite, carnallite, bischofite III. Na-K-Mg-Ca-Cl Hydrothermal...Na2S04 halite, sylvite, and MgS04 minerals carnallite, bischofite, tachyhydrite, antarcticite " See...-anhydrite-halite-sylvite-carnallite-bischofite-tachyhydrite kieserite-kainite-carnallite-bischofite kieseri...kieseri te-carnallite-bischofite bischofite CaJci te-gypsum-anhydrite-hali te-sylvi te-carnallite-antarctici |
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| deposits of oceanic origin. Association: Kainite, carnallite, sylvite, halite, kieserite, bischofite, anhydrite...the Santa Rosa de Lima and Taquari Basins, Sergipe, Brazil, with reserves estimated at 4 billion t. On |
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| accumulation of potassic minerals (sylvite and carnallite) but contain some tachyhydrite, and minor amounts...halite with potassic minerals of sylvite (KCl) and carnallite (KCl MgCl2 .6H2 O), red beds and minor anhydrite...halite and gypsum and the paragenesis of the carnallite=sylvite assemblage in the Maha Sarakham Formation...capital city of Laos, and shortly thereafter, carnallite as well as sylvite were found on the Thai side...The potash minerals include sylvite (KCl) and carnallite (MgCl2 ÐKClÐ6H2 O) which are found at the top |
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| Margens Continentals do Tipo Atl~ntieo, Silo Paulo, Brazil - - November 1975. This paper is a contribution...words: Continental Margins, Brazil: geology; Brazil: stratigraphy; Brazil: tectonics; Gondwanaland, Sedimentary...two areas: (a) the area from the Pelotas to the Sergipe-Alagoas basin, and (b) that of the Reeife-Joao...a f r o m Pelotas to Sergipe-Alagoas: In the area from Pelotas to Sergipe-Alagoas, most of the faults...of horsts and grabens typical of the Campos to Sergipe-Alagoas basins (Fig. 10.2) are not observed by |
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| conditions. The potassium-magnesium salts (K-Mg salts) carnallite and bischofite are prime examples of layers with...K-Mg chlorides bischofite (MgCl2 × 6H2 O) and carnallite (KMgCl3 × 6H2 O), are rheologically and mechanically...salts. In this study we focus on bischofite and carnallite, although we note that other salts like tachydrite...which have been described in evaporites offshore Brazil (Poiate et al., 2006). The low viscosity of deeply...(Williamson et al., 1998). On the other hand, carnallite and bischofite are economically interesting and |
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| that include halite, gypsum, sylvite (KCl) and carnallite (MgCl2 . KCl2 . H2O). However, based on the petrographic...cycles composed of halite, sylvite and subordinate carnallite, which show delicately, well-preserved, primary...poikilitically enclosed by anhedral crystals of sylvite. Carnallite Fig. 10. Salt growth structures (all figures...suggests a syndepositional cement origin for such carnallite. Absence of alteration rims around sylvite crystals...potash deposits that contain primary sylvite and carnallite and lack MgSO4 salts have been precipitated from |
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| and Mesozoic marine evaporites contain sylvite, carnallite, or both, 1. INTRODUCTION Since Rubey’s (1951)...Saturation indexes for potash minerals (sylvite, carnallite, MgSO4 minerals, etc.) were calculated on the...halite of the Congo Basin in Africa, the Sergipe Basin in Brazil, and the Khorat Plateau in Thailand and...sequence but include tachyhydrite, sylvite, and carnallite. Hardie (1990) and Garrett (1996) proposed a...brines are saturated with respect to sylvite, carnallite, or both, suggesting that much of the information |
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| relatively early, in Br-rich brines derived from carnallite dissolution, whereas we did not. Table 2 summarizes...summarizes the Br content of halite, sylvite, and carnallite expected at the beginning of bittern salt precipitation...once contained abundant carnallite, and if sylvite formed from this carnallite, then considerable volumes...is commonly interpreted to be a replacement of carnallite (Braitsch, 1971; Wardlaw, 1968; Sonnenfeld, 1989)...predicted for sylvite which has recrystallized from a carnallite precursor, however (Wardlaw, 1968; Holser, 1979) |
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| scale. The system NaCl-KCl-MgCl,-H,O and for carnallite. at 25°C Adding MgCI, to the NaClm~KCl-~H20...sylvite and introduces bischofite (MgCl, 6Hz0), and carnallite (KMgCl,.6H,O) into the system. Equilibrium constants...Table 5. Comparison of Lerman‘s calculations on carnallite solubility with those of this study. (A) Lerman...log m,., A 6 log U,,>() = 4.10. (24) Although carnallite dissolves incongruently at 25 (Fig. 5). the equilibrium...saturated with carnallite. The solutions listed in Table 5 are reported to be saturated with carnallite and a |
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| curves for halite-sylvite, halite-carnallite and sylvite-carnallite are shown for reference. The primary...949-956 Evans R (1970) Genesis of sylvite and carnallite-bearing rocks from Wallace, Nova Scotia. In JL...mineral petrogr Mitt 56:641-647 Wardlaw NC (1968) Carnallite-sylvite relationships in the Middle Devonian...magnesium chloride in cretaceous basins of Sergipe, Brazil. Econ Geol 67:156-168 Warren JK (1982) The |
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| evolved evaporite of marine origin (like sylvite, carnallite or bischofite), or (3) the recrystallization...entirely precluded, it is probable that sylvite and carnallite deposition would have removed most of the K +...primary brine, is negligible due to sylvite and carnallite removal, a value of x~2.4% is calculated for...r - / C 1 - ratio in tachyhydrite deposits from Brazil range from ~0.3-10 -2 to ~0.5.10 -2 mol mo1-1 (Wardlaw...1 - )c~ystaL/(Br- / CI- )brine, is ~ 0.3 for carnallite at the onset of bischofite deposition (Braitsch |
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| by assemblages containing halite, sylvite and carnallite and entirely free or very poor in the magnesium-sulfate...that includes epsomite/astrakanite, kainite, carnallite, kieserite and bischofite (Borchert & Muir 1964;...polyhalite, epsomite, hexahydrite, kieserite, carnallite, bischofite. In reality, basin-margin recharge...haliteepsomite-hexahydrite-kieserite-kainite-carnallite-bischofite CaCO3-gypsum-anhydrite-glauberite...ite-polyhaliteepsomite-hexahydrite-kieserite-carnallite-bischofite CaCO3-gypsum-anhydrite-halite-pol |
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| or marly residuals (hardground), or MgC!2 from Carnallite, by leaving Sylvite etc. Breaks within the progressive...Hartsalz- u n d Carnallit-Fazies postulieren, dab Carnallite, wo sie in primiirer Bildungsform erhalten blieben...Anteil der unterkretazischen Salzlagerst/itte von Sergipe, Brasilien. An fast allen diesen Lokalit/iten ist |
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| after all K ÷ has been removed by sylvite and carnallite ( (KC1,MgC12)" 6H20) precipitation. Boron, Ca...epsomite and other Mg-SO4 salts (E); sylvite (S); carnallite (C); bischofite (B); tachyhydrite (T). Experimental...beginning 4.0 Sylvite beginning 5.0 Carnallite beginning 5.1 Carnallite 6.0 Bischofite beginning TDS (gl...Bassanite Epsomite Kieserite Kainite Sylvite Carnallite Bischofite Samples SrSO4 CaSO4"2H20 CaSO4 NaCI...completely depleted in K + by sylvite, and possibly by carnallite precipitation, all available Na + should have |
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| papas sa asiSN PEspossns ESE MSE eat 825 828 829 Brazil Chapter 34. MESOZOIC RIFT BASINS AROUND THE NORTHEAST...NORTHEAST BRAZILIAN — TUCANO (RECONCA VO — JATOBA, SERGIPE— ALAGOAS) E.J. Milani, M.C. Lana and P. Szatmari...Rec6ncavo graben . Sedimentary evolution of the Sergipe— Alagoas basin Structural MICROPLATE ..........Structural framework of the Sergipe— Alagoas basin . Tectonic evolution of the Sergipe— Alagoas basin ........anhydrite upon burial), halite, and potash salts (carnallite or sylvite). The maximum mineral facies attained |
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| Lower Cretaceous rocks of west Africa and southern Brazil..................................................or possibly from the western rift margin, now in Brazil. The Toca Formation represents the uppermost syn-rift...parts of the Aptian salt basin and the southern Brazil basins (fig. 17), where the syn-rift rocks are...a high volume of salts; these comprise mainly carnallite (KMgCl3·6H2O) and minor amounts of bischofite...and composed of halite, potash salts (such as carnallite), and minor anhydrite. As many as four evaporite |
