The unique Novaya Zemlya collection at NHM

Transcription

1 The unique Novaya Zemlya collection at NHM (update, photography and initial analysis) Hans Arne Nakrem (Natural History Museum, University of Oslo) 26 January 2007

2 Holtedahl s 1921 route with the vessel Blaafjeld Left Oslo 16 June, Tromsø 26 June, Vardø 30 June, arrived NZ 3 July, returned to Tromsø 8 September.

3 Some localities visited: Pomorskaya Bay One Samoyede gave me a number of beautifully preserved ammonites which had been found as loose stones at various places in the neighbourhood.

4 Devonian localities: W Matotchkin Strait Serebryanka Fiord area: Dark/black limestones

5 Devonian-Carboniferous localities: Sulmeneva Mashigin Fjords Admiralty Peninsula Western Novaya Zemlya Structural Unit Devonian Permian rocks

6 Carboniferous: Cape Productus (Cape Borisoff) grey / dark carbonates,, brachiopods and corals

7 NW Novaya Zemlya Carboniferous Devonian, carbonates and volcanics Northernmost: 20 August

8 NW Novaya Zemlya Devonian clastics and volcanics

9 Collection contents Age and fossil/rocks + published material = 4110 samples Note: Continuous work on the samples provide new information better data

10 Paleontological Type Collection (= published material)

11 Identified according to modern lithostratigraphy See map, localities that are now in- accessable Note: Continuous work on the samples provide new information better data

12 Novaya Zemlya structural elements and sampled localities Northern NZ Best sampled areas Eastern NZ Localities that are now inaccessable, central Novaya Zemlya Western NZ N and S tips are accessible, cf. recent western fieldwork

13 A unique collection for collaborative research NOVAZEM General objectives: Detailed study of the Novaya Zemlya samples (4000 samples, Devonian-Jurassic age) Litho-Bio-Chrono-Sequence stratigraphy of Novaya Zemlya and eastern Barents Sea, placed in an Arctic geological framework Paleogeography, sediment provenance, sedimentology, stratigraphy burial history and hydrocarbon maturation of Novaya Zemlya strata

14 NOVAZEM Specific objectives: Biostratigraphy utilizing conodonts, brachiopods, corals, ammonoids, foraminifera (fusulinids), palynology (acritarch, chitinozoans) Sediment characteristics of each sample: photographs, description, place in stratigraphic chart, place on new geological map, density and porosity, gamma ray, magnetic susceptibility, XRF major element composition, mineralogy and RF/SEM/EDA thin sections, diagenesis and reservoir quality assessment. Sedimentary setting and sediment provenance Maturation (organic indices, kerogen, Rock Eval, TOC, molecular chromatography, biomarkers) Chrono-sequence stratigraphy Burial and uplift history (timing/fission track) Paleogeography (especially Devonian/Carboniferous)

15 Maturation (conodont CAI), thin sections (carbonates and siliciclastics) Dark lst.. with corals: diagenesis Por.-perm. Organic mat. Devonian silt-s.stone s.stone mineralogy provenance Sobolev & Nakrem, 1996

16 Refined paleogeography (Early Carboniferous) Novaya Zemlya D. Worsley 2006 Sobolev, Schekoldin et al.

17 Planned reports 2007: Complete sample documentation, incl. photographs, type of analysis planned or already done. Jurassic-Cretaceous Correlations and Paleobathymetry, Eastern Barents Sea Planned reports in 2008 and 2009: (Contribute to) improved geological map of Novaya Zemlya Biostratigraphy of Novaya Zemlya samples Physical properties of Novaya Zemlya samples Organic maturation of Novaya Zemlya samples Planned Reports in 2009 and 2010: Sediment properties and provenance Reports (with collaborators): Late Paleozoic to Mesozoic Tectonics, Sedimentation and Burial History Late Mesozoic to Cenozoic Stratigraphy and Burial History, Barents Sea Interactive Charts of Phanerozoic Sequence Stratigraphy and Paleogeography

18 Work done in 2006 Samples assigned to modern lithostratigraphy (Sobolev, Schekoldin, Davydov) All samples photographed (x2) Localities refined (map referenced) according to new geological map Initial analysis: Zircons/isotopes, org. geochem. Web database: REPORT PDF Thin section from Cape Diabase, Mashigin Fiord