Lead mobilization during tectonic reactivation of the western Baltic Shield

Romer, Rolf L.; Wright, James E.

doi:10.1016/0016-7037(93)90417-u

Cited by 53 publications

(38 citation statements)

References 46 publications

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“…All show highly radiogenic compositions ( Figure 15) with a relatively limited variation. The data form part of a larger trend distinguished by galena data from different deposit types located within, or near the Caledonides [26,27]. It should be emphasised that there is no obvious isotopic difference among different minerals from the same deposit suggesting that Th/Pb and U/Pb ratios (not available) are low for all analysed minerals.…”

Section: Pb Isotopesmentioning

confidence: 78%

“…The genetic model presented here for the fracture-controlled Zn-Pb deposit type is similar to the basement reactivation model proposed by Romer and Wright [27] with a major difference being that the former ore deposits are considered to be due to a pre-Caledonian rifting event. Caledonian nappes probably covered the Ersmarksberget mineralisation and other studied occurrences (including the easternmost occurrence at Nyliden).…”

Section: Constraints On the Timing Of Ore Formationmentioning

confidence: 96%

“…Other 0.4-0.6 Ga sulphide ore types within the Caledonides and along its margin include: (i) stratiform base metal ores in the higher Caledonian nappes [41] and references therein; (ii) caledonian sulphide-bearing quartz veins [27,28]; (iii) sandstone hosted Zn-Pb impregnation ores at the margin [2,42]. The stratiform ore type comprises polymetallic chalcopyrite-rich massive sulphide deposits that have been affected by high-temperature (≥400 °C) Caledonian metamorphism and deformation [43].…”

Section: A Comparison Between the Lsod Zn-pb Deposits And Nearby Sulpmentioning

confidence: 99%

“…Romer and Wright [27] have shown that Phanerozoic Pb mobilisation has occurred at several places within the Fennoscandian shield and they attributed this to tectonically induced fluid flow related to different orogenies. It is very likely that certain ore types in the Caledonides formed as a result of thrusting, but there is no a priori reason to claim that all ore types in settings near the Caledonides have the same origin and were formed at the same time.…”

Section: Constraints On the Timing Of Ore Formationmentioning

confidence: 99%

“…Moreover, Romer and Wright [27] related certain radiogenic galenas to the formation of a ca. 450 Ma graben structure along the Gulf of Bothnia.…”

Section: Constraints On the Timing Of Ore Formationmentioning

confidence: 99%

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Zn-Pb Ores of Mississippi Valley Type in the Lycksele-Storuman District, Northern Sweden: A Possible Rift-Related Cambrian Mineralisation Event

et al. 2012

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Abstract:The epigenetic Zn-Pb deposits in the Lycksele-Storuman ore district, northern Sweden, are hosted by Paleoproterozoic basement near the margin of the Caledonian mountains. A paleogeographic reconstruction suggests that platform sediments, including Cambrian shales, overlaid the mineralised basement. The mineralisation type, containing sphalerite, galena, calcite and fluorite, is confined to veins and breccias and interpreted to be of Mississippi Valley Type (MVT) style. There is no appreciable wall rock alteration. Fluid inclusion work reveals coexisting aqueous and hydrocarbon fluids. Ore deposition is interpreted to have occurred during mixing of two fluids; a cool (<70 °C) brine with a salinity of 30 eq. mass% CaCl 2 and a hot (~200 °C) brine with about 18 eq. mass% CaCl 2 . The mixing led to complex Sr isotope systematics in the analysed minerals. A tentative sphalerite Rb-Sr isochron age of a 534 ± 13 Ma probably dates mineralisation. The isotope systematics of Pb and Nd are less complex and both elements were essentially leached OPEN ACCESSMinerals 2012, 1 170 from basement rocks and transported by the hot fluid. Ore formation is considered to have taken place during rifting, related to the opening of the Iapetus Ocean.

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Section: Pb Isotopesmentioning

confidence: 78%

Section: Constraints On the Timing Of Ore Formationmentioning

confidence: 96%

Section: A Comparison Between the Lsod Zn-pb Deposits And Nearby Sulpmentioning

confidence: 99%

Section: Constraints On the Timing Of Ore Formationmentioning

confidence: 99%

“…Moreover, Romer and Wright [27] related certain radiogenic galenas to the formation of a ca. 450 Ma graben structure along the Gulf of Bothnia.…”

Section: Constraints On the Timing Of Ore Formationmentioning

confidence: 99%

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Zn-Pb Ores of Mississippi Valley Type in the Lycksele-Storuman District, Northern Sweden: A Possible Rift-Related Cambrian Mineralisation Event

et al. 2012

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U-Pb age and lead isotopic characterization of Au-bearing skarn related to the Andorra granite (central Pyrenees, Spain)

Romer

Soler

1995

Mineral. Deposita

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Abstract. Auriferous skarns are associated with post-and late-kinematic Hercynian granites that intruded into Cambro-Ordovician to Devonian sediments of the central Pyrenees. We determined the age of the Andorra granite and the associated skarn at 305 + 3 Ma by U-Pb dating titanite from the endo-skarn. The sulfur isotopic composition from sulfides in the skarn shows a significant variation with isotopically light sulfur (c~34S ~ + 3) in the barren skarns and heavy sulfur (•34S ~ + 11) in the gold-bearing skarns. Outwards, it increasingly resembles sulfur from arsenopyrite disseminations in the Cambro-Ordovician sediments. The lead isotopic composition from sulfides of the skarns is very homogeneous (2~176 = 18.410, 2~176 = 15.699, 2~176 = 38.574) in contrast to the one in gold-bearing arsenopyrite veins and in arsenopyrite disseminations in the sediments (e.g. 2~176 varies from 18.54 to 30.36). Combined, sulfur and lead isotope data indicate that the lead in the skarn is dominantly derived from the granite, whereas the sulfur is derived at variable portions from both the granite and the sediments.gold and arsenic are associated with isotopically heavier sulfur. Because of this correlation, Cardellach et al. (1992) suggested that most of the As and Au content in the skarn deposit were remobilized from arsenopyrite disseminations in Cambro-Ordovician sediments. The aim of this paper is to investigate the role of the Andorra granite in the formation of gold-bearing skarn deposits spatially associated with it. Did the granite only act as a heat source to mobilize fluids and metals from the surrounding metasediments to form the skarns or did the granite additionally contribute metals to the skarn deposit?We determine the galena-lead and trace-lead isotopic composition on the same mineral fractions that previously were used for sulfur isotope investigation Ayora et al. 1992) and use the two isotope systems together to characterize the metal sources. In addition, we present a U-Pb titanite age determination on the skarn deposit. This dating indirectly also yields the age of the Andorra granite and it represents the first precise U-Pb age determination of post-and late-kinematic Hercynian granites in the central Pyrenees of Spain.Post-and late-kinematic Hercynian granites of the Spanish Pyrenees intrude into Cambro-Ordovician to Devonian sediments (Fig. 1). The granites are locally associated with subeconomic gold-bearing skarn deposits ; Soler and Ayora 1991). The CambroOrdovician sediments in places contain arsenopyrite disseminations and arsenopyrite-bearing veins . Earlier studies on these skarn deposits have demonstrated that the sulfur in the skarn comes from two sources: isotopically light sulfur originating from the skarnforming granites and heavy sulfur derived from the Cambro-Ordovician sediments . Among the different types of skarn, there is a positive correlation between the isotopic composition of the sulfur and the contents of gold and arsenic. Higher contents of * Present address: Department of Applied Ge...

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Scapolite: a tracer for the initial lead isotopic composition in sulfide deposits with later additions of radiogenic lead

1996

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Lead mobilization during tectonic reactivation of the western Baltic Shield

Cited by 53 publications

References 46 publications

Zn-Pb Ores of Mississippi Valley Type in the Lycksele-Storuman District, Northern Sweden: A Possible Rift-Related Cambrian Mineralisation Event

Zn-Pb Ores of Mississippi Valley Type in the Lycksele-Storuman District, Northern Sweden: A Possible Rift-Related Cambrian Mineralisation Event

U-Pb age and lead isotopic characterization of Au-bearing skarn related to the Andorra granite (central Pyrenees, Spain)

Scapolite: a tracer for the initial lead isotopic composition in sulfide deposits with later additions of radiogenic lead

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