Early Cretaceous radiolarians of the Northeast Indian Ocean (leg 123 - site 765, site 766 and dsdp site 261) - The Antarctic-Tethys connection

During ODP Leg 123, abundant and well-preserved Neocomian radiolarians were recovered at Site 765 (Argo Abyssal Plain) and Site 766 (lower Exmouth Plateau). Assemblages are characterized by the numerical dominance of a small number of non-tethyan forms and by the scarcity of tethyan taxa. Remarkable contrasts exist between radiolarian assemblages extracted from claystones of Site 765 and reexamined DSDP Site 26 1, and faunas recovered from radiolarian sand layers, only found at Site 765. Clay faunas are unusual in their low diversity of apparently ecologically tolerant (or solution resistant?), ubiquist species, whereas sand faunas are dominated by non-tethyan taxa. Comparisons with Sites 766 and 26 1, as well as sedimentological observations, lead to the conclusion that this faunal contrast resulted from a difference in provenance, rather than from hydraulic sorting or selective dissolution. The ranges of 27 tethyan taxa from Site 765 were compared to the tethyan radiolarian zonation by Jud (1992) by means of the Unitary Associations Method. This calculation allows to directly date the Site 765 assemblages and to estimate the amount of truncation of ranges for tethyan taxa. Over 70% of the already few tethyan species of Site 765, have truncated ranges during the Valanginian-Hauterivian. Radiolarian assemblages recovered from claystones at Sites 765 and 261 in the Argo Basin apparently reflect restricted oceanic conditions during the latest Jurassic-Barremian. Neither sedimentary facies nor faunal associations bear any resemblance to what we know from typical tethyan sequences. We conclude that the Argo Basin was paleoceanographically separated from the Tethys during the Late Jurassic and part of the Early Cretaceous by its position at higher paleolatitudes and/or by enclosing land masses. Assemblages recovered from radiolarian sand layers are dominated by non-tethyan species that are interpreted as circumantarctic. Their first appearance in the late Berriasian-early Valanginian predates the oceanization of the Indo-Australian breakup (M11, late Valanginian), but coincides with a sharp increase in margin-derived pelagic turbidites. The Indo-Australian rift zone and the adjacent margins must have been submerged deeply enough to allow an intermittent influx of circumantarctic cold water into the Argo Basin, creating increased bottom current activity. Cold-water radiolarians carried into the Argo Basin upwelled along the margin, died, and accumulated in radiolarite layers due to winnowing by bottom currents. High rates of faunal change and the sharp increase of bottom current activity are thought to be synchronous with possible pronounced late Berriasian-early Valanginian lowstands in sea level. Hypothetically, both phenomena might have been.caused by a tendency to glaciation on the Antarctic-Australian continent, which was for the first time isolated from the rest of Gondwana by oceanic seaways as a result of Jurassic-Early Cretaceous sea-floor spreading. The absence of most typical tethyan radiolarian species during the Valanginian-Hauterivian is interpreted as reflecting a time of strong influx of circumantarctic cold water following oceanization (M11) and rapid spreading between Southeast India and West Australia. The reappearance and gradual abundance/diversity increase of tethyan taxa, along with the still dominant circumantarctic species are thought to result from overall more equitable climatic conditions during the Barremian-early Aptian and from the establishment of an oceanic connection with the Tethys Ocean during the early Aptian.

Documents et pièces diverses, en majeure partie originaux, conservés jadis dans le TRESOR DES CHARTES DE LORRAINE. — Nombreux sceaux. — Voy. l'analyse détaillée de la plupart de ces pièces dans l'Inventaire de Dufourny (Bibl. nat., ms. fr. 4880-4886 ; Bibl. de Nancy, mss. 754-765). On ne relève ici que les pièces qui n'y figurent pas. XLV — Portefeuille-layette 23 b (1344-1622)

Metz évêché ; Bulles et autres pièces, n os 1-10, 12-14, 17-24, 26-36. Voy. Bibl. nat., ms. fr. 4883, pp. 7789-7800 ; Bibl. de Nancy, ms. 763, 1 re partie, pp. 167 et 168. — Voy. ms. fr. 4883, pp. 7761-7789.

Documents et pièces diverses, en majeure partie originaux, conservés jadis dans le TRESOR DES CHARTES DE LORRAINE. — Nombreux sceaux. — Voy. l'analyse détaillée de la plupart de ces pièces dans l'Inventaire de Dufourny (Bibl. nat., ms. fr. 4880-4886 ; Bibl. de Nancy, mss. 754-765). On ne relève ici que les pièces qui n'y figurent pas. LXXXVIII — Portefeuille-layette 44 b (1403-1496)

Contient : Vidimus (1497) des lettres de Marguerite, duchesse de Bourgogne, portant réception de l'hommage de Ferry, comte de Vaudémont, pour une rente sur le tonlieu de Damme (Arras, 22 novembre 1404) ; Affranchissement accordé par Marguerite de Joinville, comtesse de Vaudémont, à Geoffroy Parmentier et à Jeannette, sa femme, demeurant à Vézelise (1415) ; Lettres d'Antoine de Lorraine au duc de Bar, au sujet de déprédations commises dans la terre de Montiers-sur-Saulx (Vézelise, 1430) ; Déclaration de Philippe le Bon, duc de Bourgogne, concernant la mise en liberté de prisonniers faits depuis la trève, conclue sur sa médiation entre le duc de Bar et le comte de Vaudémont (1432) ; Lettres de Charles VII au comte Antoine (1443) ; Lettres du roi René au même (1435-1437) ; Lettres de la duchesse Isabelle au même (1435) ; « Instrument de Joffroi Bouquin, pour un accort fait à Condet-sur-Muselle, le xxije jour d'aoust l'an lxij, entre Pierre de Moncelz et le dit Joffroi pour ma dame, et messire Jehan de Saulmez pour monseigneur le duc de Bar » (28 mars 1363 ; n° 91 de la layette Traités III) ; Lettres du roi René portant don à Ferry II, comte de Vaudémont, du montant de l'imposition de 16 fl. par feu dans les seigneuries possédées par le dit Ferry en Provence (Angers, 27 décembre 1467) ; Vidimus (1477) des lettres du roi René, concédant la seigneurie de Beaufrémont au comte de Vaudémont (Marseille, 13 avril 1470) ; Mandement du roi René pour le paiement des gages de René, comte de Vaudémont, nommé gouverneur d'Anjou (Aix, 7 février 1473) ; Instructions données à Jean de Saint-Amadour et Huyn Roynette, lieutenant de Nancy, pour une mission auprès du roi (XVe siècle)

Documents et pièces diverses, en majeure partie originaux, conservés jadis dans le TRESOR DES CHARTES DE LORRAINE. — Nombreux sceaux. — Voy. l'analyse détaillée de la plupart de ces pièces dans l'Inventaire de Dufourny (Bibl. nat., ms. fr. 4880-4886 ; Bibl. de Nancy, mss. 754-765). On ne relève ici que les pièces qui n'y figurent pas. VII — Portefeuille-layette 5 (1400-1422)

Duc des Monts, n os 1-12. — Voy. Bibl. nat., ms. fr. 4882, pp. 3593-3598 ; Bibl. de Nancy, ms. 758, pp. 295-301. — Pièces concernant les prétentions d'Adolphe, duc de Berg, sur le duché de Bar, à cause de son mariage avec Yolande, fille de Robert, duc de Bar.

Documents et pièces diverses, en majeure partie originaux, conservés jadis dans le TRESOR DES CHARTES DE LORRAINE. — Nombreux sceaux. — Voy. l'analyse détaillée de la plupart de ces pièces dans l'Inventaire de Dufourny (Bibl. nat., ms. fr. 4880-4886 ; Bibl. de Nancy, mss. 754-765). On ne relève ici que les pièces qui n'y figurent pas. LXVII — Portefeuille-layette 32 a (1436-1456)

Rançon du roi René, n os 31-49, 51-54, 56-61. — Voy. Bibl. nat., ms. fr. 4884, pp. 9522-9528 et 9505-9508.

Documents et pièces diverses, en majeure partie originaux, conservés jadis dans le TRESOR DES CHARTES DE LORRAINE. — Nombreux sceaux. — Voy. l'analyse détaillée de la plupart de ces pièces dans l'Inventaire de Dufourny (Bibl. nat., ms. fr. 4880-4886 ; Bibl. de Nancy, mss. 754-765). On ne relève ici que les pièces qui n'y figurent pas. XXXIV — Portefeuille-layette 16 (1312-1605)

Contient : Vidimus (1449) de quatre chartes relatives à Wolkrange (1400-1435) ; Don fait par Guérard de Rodemach à Kustgen von Rutgen, son vassal, de divers revenus en nature (1464) ; Lettres de Gilze von Busleiden, autorisant André d'Haraucourt à racheter, dans les douze ans, une rente qu'il avait constituée à son profit (1487) ; Accord entre Philippe, marquis de Bade, et Jean de Créhange, d'une part, et Marguerite d'Haraucourt, d'autre part, sur certaines contestations (1524) ; Investiture donnée au nom du roi d'Espagne à Georges de Créhange, pour ses fiefs mouvant des duché de Luxembourg et comté de Chiny (1572) ; Mémoire sur le ban de Rixange ; Liste des seigneurs, prélats, officiers, etc., convoqués aux États de Luxembourg

Na 50 Nachlass Arthur Schopenhauer - 'Schopenhauer-Archiv', 765 - Mitteilung über die noch nicht erteilte Generalvollmacht an Hinrich Burghart Abegg

u.a. Abstimmungen über das weitere Verfahren in der Erbschaftssache;

Distribution of dinoflagellate cycst at ODP Site 123-765 (Table 1)

Site 765 contains a sequence of tropical, middle Miocene to Holocene dinoflagellate cysts. These diverse assemblages are characterized by abundant Polysphaeridium zoharyi and Spiniferites bulloideus. Abundances of Impagidinium spp. and Nematosphaeridium spp. reflect the shelf-to-slope origin of the assemblages. One new genus, Blysmatodinium, and two new species, Nematosphaeridium (?) wrennii sp. nov. and Blysmatodinium argoi, are described.

Pollen abundance in ODP Site 123-765 (Table 1)

Middle Miocene to Holocene pollen assemblages reveal a history of environmental change in northern Australia. Grass pollen appeared, but was rare, in the late Miocene and was consistently present throughout the Pliocene, but did not become abundant until the Pleistocene. Myrtaceae pollen, characteristic of late Cenozoic assemblages in eastern Australia, is poorly represented, and no unequivocal evidence of rain forest was found.

Geochemistry of ODP Sites 123-765 and 123-766

The sediments of the Argo and Gascoyne abyssal plains are generally lean in organic matter, are immature, and contain hydrocarbons trapped during sediment deposition rather than those generated during sediment catagenesis. TOC concentrations in the Argo Abyssal Plain Cenozoic sediments are 0.5 wt%, and organic matter appears to be from mixed marine and reworked, degraded, organic matter sources, with the latter being contributed by turbidity flows from the nearby continental margin. TOC concentrations within the Cenozoic sediments of the Gascoyne Abyssal Plain are mostly undetectable (<0.1 wt%). Biomarker distributions determined by gas chromatography (GC) and gas chromatography-mass spectrometry (GCMS) indicate that organic matter extracted from the Lower Cretaceous sediments from both sites is predominantly marine with varying contributions from terrestrial organic matter. The specific marine biomarker, 24-n-propylcholestane is in relatively high abundance in all samples. In addition, the relatively high abundance of the 4-methylsteranes with the 23,24-dimethyl side chain (in all samples) indicates significant dinoflagellate contributions and marine organic matter. The ratios of n-C27/n-C17 reflect relative contributions of marine vs. terrestrial organic matter. TOC, while generally low at Argo, is relatively high near the Barremian/Aptian boundary (one sample has a TOC of 5.1 wt%) and the Aptian/Albian boundary (up to 1.3 wt% TOC), and two samples from the Barremian and Aptian sections contain relatively high proportions of terrestrial organic carbon. TOC values in the Lower Cretaceous sediments from Gascoyne Abyssal Plain are low (<0.1 wt%) near the Aptian/Barremian boundary. TOC values are higher in older sediments, with maxima in the upper Barremian (1.02 wt%), the Barremian/Hauterivian (0.6 wt%), and Valanginian (1.8 wt%). Sediments from the upper Barremian contain higher amounts of terrestrial organic carbon than older sediments.