Lingulate brachiopods from the Cambrian—Ordovician boundary beds in Sweden

Puura, Ivar; Holmer, Lars E.

doi:10.1080/11035899309452754

Cited by 23 publications

(20 citation statements)

References 14 publications

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“…Viira et al (2004) detected the reworking of P-rich sediments in the Hunneberg-Billingen stages, which indicates that part of the high P content in the Floian-early Darriwilian interval may come from the underlying Tremadocian sediments. The occurrences of Hunneberg-Billingen lingulates (Puura 1996) also point to elevated P in seawater of that time. Kiipli et al (1984) suggested redeposition of lower Ordovician sediment in early Kunda time.…”

Section: Resultsmentioning

confidence: 94%

Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin

Kiipli¹,

Kiipli²,

Kallaste³

et al. 2010

Estonian J. Earth Sci.

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Baltoscandian Middle and Upper Ordovician carbonate rocks are relatively poor in phosphorus, with the P2O5 content of 0.05–0.5%, rarely exceeding 1%. Phosphorus distribution in the Ordovician carbonate succession shows spatial and temporal variations. In the Estonian Shelf P content is the highest in the Middle Ordovician, close to the Tremadocian P-rich siliciclastic sediments, decreasing towards younger carbonate rocks. In the basinal, i.e. deep shelf, sections two intervals of elevated P contents occur: the first is similar to the shallow shelf in the lowermost Darriwilian, the second is a moderate P increase in the upper Darriwilian–Sandbian interval. The Darriwilian–Sandbian interval of elevated P content in the deep shelf sections roughly corresponds to algal kukersite accumulations in the shallow shelf. Multiple processes determined phosphorus distribution in the studied sediments. Regional processes influencing P distribution include seawater circulation, e.g. P influx by coastal upwellings, and sedimentation rate. Global oceanic variation in bioproduction (δ13C trends) had no positive effect on P accumulation in the Baltoscandian epeiric sea

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Section: Resultsmentioning

confidence: 94%

Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin

Kiipli¹,

Kiipli²,

Kallaste³

et al. 2010

Estonian J. Earth Sci.

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“…4). Basal Ordovician rocks have in several places been observed in original position on top of the Proterozoic basement, whereas Cambrian sediments occur in loose boulders (Puura & Holmer 1993).…”

Section: The Siljan Cratermentioning

confidence: 99%

Concentric impact structures in the Palaeozoic of Sweden – the Lockne and Siljan craters

Högström

Sturkell

Ebbestad

et al. 2010

GFF

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The Ordovician age Lockne and Devonian Siljan craters are two of the largest impact structures in northern Europe. Both formed in targets with a thick, low-strength upper layer. This target configuration is known to generate concentric crater structures with an outer, shallow crater in the low-strength layer, surrounding a central, deeper crater in the more resistant substrate. The concentric craters of Lockne and Siljan are excellent models for studies of similar concentric craters on Earth and elsewhere in the Solar system. Several structural issues remain, and drilling through the craters within the Swedish Deep Drilling Program intends to address the following: the extent of the craters with respect to the time of impact; the effects of cratering on the basement; and the role of basement structure for the crater formation. A problem for the Lockne crater is the relation to the Caledonian orogeny and the lateral extension of the ejecta blanket -the rim is interrupted by a radial depression that has been interpreted both as primary and secondary, tectonically induced. A second feature to study is the deeper and older (1.82-1.80 Ga) NNW-SSE shear zones that cut the basement. In the Siljan area the development of mega block associations comprising the infilling of the graben is disputed. The blocks may either be formed by sagging of peripheral parts of the fault blocks or alternatively by major radial movement involving kilometre long transport.

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“…3). Diversification of endemic lingulide taxa in the near-shore and shallow shelf environments was a major contribution to the increased faunal diversity, but the appearance of the acrotretides Angulotreta, Quadrisonia and Ceratreta suggests some linkage with micromorphic lingulate brachiopod faunas of the Laurentian margins and of East Gondwana (Popov et al 1989;Puura & Holmer, 1993;Palmer, 1954;Roberts & Jell, 1990). 3), with origination rates exceeding 0.5 Lma most of the time and extinction rates increasing up to 0.33 Lma at the end of the Cambrian.…”

Section: Fossil Samples and Biodiversity Patternsmentioning

confidence: 99%

Neodymium isotopic composition of Cambrian–Ordovician biogenic apatite in the Baltoscandian Basin: implications for palaeogeographical evolution and patterns of biodiversity

et al. 2005

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Biogenic apatite preserved in 148 samples of conodonts and organophosphatic-shelled brachiopods from Cambrian through Ordovician successions of the Baltoscandian Basin (Baltica Plate) preserves a sensitive record of early Palaeozoic sea-water chemistry interpreted via neodymium isotope ratios. Consistent ε Nd (t) values of −9.6 to −8.3 for Lower to Middle Cambrian samples suggest no significant lateral or temporal variation across the region. Average Upper Cambrian values are −7.2 to −7.7. Sedimentary analysis suggests that the influence of continental weathering from Baltica as a major source of radiogenic Nd was negligible. Ordovician samples show a rise to −5 to −6 in the early Arenig, early-mid Llanvirn and late Caradoc. Sea-water mixing from the southeast Iapetus Ocean was a constant factor throughout Cambrian-Ordovician times. The rise reflects erosion of obducted volcanic arc complexes along the Caledonian margin, and probably also relates to pollution of the Baltica sector of Iapetus from the approaching Avalonia Plate. Patterns of evolutionary biodiversity and palaeobiogeographical linkages support the geochemical signatures in interpreting the tectonic history of the region. Extinction of lingulate brachiopod faunas in the Tremadoc, followed by subsequent recovery and emergence of benthic assemblages typical of the Ordovician Evolutionary Fauna in the Billingen-early Volkhov regional stages coincide with significant changes in geochemical characteristics of water masses across the Baltoscandian basin. The early and mid Ordovician (Arenig to Llandeilo) brachiopod faunas of the North Estonian Confacies Belt are characterized by high endemism and low turnover rates, whereas increased immigration resulted in the extinction of a number of local lineages in the late Llanvirn. From the mid Caradoc to mid Ashgill, when Baltica was drifting on a course to collide eventually with Avalonia and gradually approach Laurentia, brachiopod assemblages were characterized by higher turnover rates. At the same time they gradually became more cosmopolitan and less influenced by the invasion of new faunas.

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Lingulate brachiopods from the Cambrian—Ordovician boundary beds in Sweden

Cited by 23 publications

References 14 publications

Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin

Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin

Concentric impact structures in the Palaeozoic of Sweden – the Lockne and Siljan craters

Neodymium isotopic composition of Cambrian–Ordovician biogenic apatite in the Baltoscandian Basin: implications for palaeogeographical evolution and patterns of biodiversity

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