DACIAN BASIN - GeoEcoMar

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24 Chapter 1. Dacian Basin. General Background FIGURE 1.5. Geological Time Scales referring to the chronostratigraphic and geochronologic framework of the Dacian Basin, as inferred from magnetobiostratigraphic and astrochronologic studies published throughout the last decade. NOTE 1: The colors used for the chronostratigraphic units/stages are suggested by the Geological Time Table of Haq (2007), published by Elsevier; NOTE 2: In the model A, the fragment on the Sarmatian (stage) resulted from the magnetobiostratigraphic investigation of the “Scăricica” Section in the Comăneşti Basin (Rădan & Rădan, 2001; Rădan, 2002); NOTE 3: In the model C, the (sub)stage boundaries marked by asterisk (*) are according to Rădan & Rădan (1998) and van Vugt et al. (2001) (option A , in Snel et al., 2006); NOTE 4: In the model D, the Siensian substage belongs to the (Upper) Dacian (cf. Andreescu, 2008), and not to the (Lower) Romanian (as in the models A, B and C), in keeping with the Neogene chronostratigraphic nomenclature in Romania (e.g., Papaianopol et al., 1995; Rădulescu et al., 1995).
1.2. Stratigraphy a) the sampling reliability of the magnetic recording medium (represented by the sedimentary sequences), particularly the stratigraphic distance between the paleomagnetic sites wherefrom the samples were collected, which should be in agreement with: ■ the sedimentation rates in the investigated sections joined with the frequency of the paleogeomagnetic events present inside of the GPTS/AT- NTS (with regard to Miocene – Pliocene, in this case); ■ the sedimentary cyclicity joined with the astronomical forcing (where applicable). Several examples of the disagreement between the stratigraphic spacing (related to the paleomagnetic sites wherefrom the oriented samples were taken) and the resulting temporal spacing are provided by some sections investigated in the eastern Dacian Basin (model GTS-D in Fig.1.5; see Andreescu, 2008). This incongruity may be particularly regarded in connection with the calibration of the achieved section magnetic polarity columns to the standard GPTS’s or APTS’s, relating to the succession of the normal - reversed polarity zones established for the corresponding chronostratigraphic time span - Sarmatian to Romanian. b) the complexity of the laboratory deconvolution works of the paleomagnetic record printed in the rock with a view to the ChRM isolation (the paleogeomagnetic field direction/magnetic polarity “fingerprint”). Hence, there is no specific (lab) information to support the magnetic polarity columns assigned to the sections on which the model D in Fig.1.5 is based (Andreescu et al., 2008); c) the complementary tools (e.g., biostratigraphy, astronomical forcing, cyclostratigraphy) involved in achieving and interpreting the magnetic polarity columns associated with the sedimentary sequences of the studied sections. For instance, van Vugt et al. (2001), who achieved in the „Fort Hoofddijk” paleomagnetic laboratory from Utrecht (The Netherlands) the same magnetic polarity zonation for a corresponding stratigraphic interval (belonging to the Lupoaia section/western Dacian Basin), previously investigated by Rădan & Rădan (1998) in the paleomagnetic laboratory from the Geological Institute of Romania, added toward a high-resolution magnetochronologic calibration – the astronomical forcing of the sedimentary cycles (cf. Lourens et al., 1996). According to the astronomical tuning of van Vugt et al. (2001) and to the magnetobiostratigraphic criteria used by Rădan & Rădan (1998), the Dacian/Romanian boundary shown in the model A (Fig.1.5) becomes 4.27±0.05 Ma, which, anyway, is very close to the age marked in the mentioned A-pattern (i.e., 4.24±0.05 Ma, cf. GPTS- CK95). Another comment refers to the model B (Fig.1.5). The authors (Vasiliev et al., 2004) carry out an analysis of the astronomical forcing of the sedimentary cycles 25
Page 1: Dan C. Jipa, Cornel Olariu DACIAN B
Page 5: Dedicated to the memory of Prof. Gh
Page 8 and 9: NATIONAL INSTITUTE OF MARINE GEOLOG
Page 11 and 12: CONTENTS Foreword and Acknowledgeme
Page 13 and 14: Contents Chapter 7. The Point Bar F
Page 15 and 16: FOREwORD AND ACkNOwLEDgEMENTS The s
Page 17: PLATE 1. Location of the Dacian Bas
Page 20 and 21: 18 Chapter 1. Dacian Basin. General
Page 42 and 43: The analysis of the paleogeographic
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74 Chapter 3. Sediment Thickness Di
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Sedimentation in the brackish-water
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84 Chapter 4. Dacian Basin Physiogr
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94 Chapter 5. Littoral Sedimentary
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Fluvial sedimentation played a majo
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The large and continuous rock expos
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158 Chapter 7. The Point Bar Facies
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190 Chapter 8. The Paleoenvironment
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The evolution and architecture of a
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200 Chapter 9. Source-Areas in the
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10.1. SEDIMENT ACCUMULATION AREAS I
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214 Chapter 10. History of the Daci
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230 Chapter 11. From Brackish-Marin
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Ai n s w o r t h r. B., Cr o w l e
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258 References hA m o r, g., et al.
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260 References mA C A r o V iC i, n
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262 References ră d A n, s.C., 200
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264 References VAsilieV, i., Kr iJ
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DACIAN BASIN - GeoEcoMar

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