scholarly journals About this title - New Caledonia: Geology, Geodynamic Evolution and Mineral Resources

10.1144/m51 ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. NP-NP
Keyword(s):  
Late Cretaceous ◽  
New Caledonia ◽  
Current Knowledge ◽  
Mineral Resources ◽  
Geodynamic Evolution ◽  
Research Papers ◽  
Sw Pacific ◽  
Geodynamic Models ◽  
Unpublished Information

This memoir summarizes current knowledge on the geology of New Caledonia, its geodynamic evolution and mineral resources, based on published and unpublished information. It comprises ten research papers, each addressing a particular geological assemblage or topic. After an introductory chapter and a review of the published geodynamic models of evolution of the SW Pacific, Chapters 3-5 focus on the main geological assemblages of Grande Terre: the pre-Late Cretaceous basement terranes, the Late Cretaceous to Eocene cover, and the Eocene Subduction-Obduction Complex, one of the largest and best-preserved in the world. Chapter 6 is devoted to the Loyalty Islands and Ridge. Chapter 7 deals with the mostly terrestrial post-obduction units, including regolith. Chapter 8 deals with palaeobiogeography and discusses plausible scenarios of biotic evolution. Chapters 9 and 10 provide a comprehensive review of New Caledonia's mineral resources. The volume will be of interest to stratigraphers, sedimentologists, marine geologists, palaeontologists, palaeogeographers, igneous and metamorphic petrologists, geochemists, geochronologists, and specialists in tectonics, geodynamic evolution, regoliths, ophiolites and economic geology.

NEW TAXA IN PAPHIA AND DIMORPHANTHERA (ERICACEAE) IN PAPUASIA AND THE PROBLEM OF GENERIC LIMITS IN VACCINIEAE

2003 ◽  
Vol 60 (3) ◽  
pp. 267-298 ◽  
Author(s):  
P. F. STEVENS
Keyword(s):  
New Species ◽  
Papua New Guinea ◽  
New Caledonia ◽  
Current Knowledge ◽  
New Guinea ◽  
Morphological Data ◽  
Sw Pacific ◽  
The Status ◽  
Three New Species ◽  
Made In

New species of Ericaceae recently collected in Papua New Guinea necessitate a re-evaluation of the status of Agapetes subgenus Paphia section Paphia. The combination of molecular and morphological data confirms that Agapetes, currently a genus of about 100 species from Fiji, New Caledonia and Queensland to mainland SE Asia, and most diverse in the latter area, cannot be maintained in its current circumscription. Various taxonomic solutions that do justice to our current knowledge of the morphology and relationships of the two main parts of the genus are discussed. The reinstatement of Paphia does least violence nomenclaturally. All 23 taxa recognized in Paphia are listed, 14 new combinations of Agapetes from the New Guinea–SW Pacific area are made in Paphia, three new species are described (P. megaphylla, P. vulcanicola and P. woodsii), and an incompletely known taxon is characterized. A key to all taxa is presented. In Dimorphanthera, five new species are described (D. angiliensis, D. anomala, D. antennifera, D. cratericola and D. inopinata), three reduced to synonymy, one reduced to a variety and one variety recognized as a species (D. continua). A key to the 87 taxa currently recognized in the genus is presented.

scholarly journals Chapter 9 Mineral resources and prospectivity of non-ultramafic rocks of New Caledonia

2020 ◽  
Vol 51 (1) ◽  
pp. 215-245 ◽  
Author(s):  
P. Maurizot ◽  
B. Sevin ◽  
S. Lesimple ◽  
J. Collot ◽  
J. Jeanpert ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Oil And Gas ◽  
New Caledonia ◽  
Mineral Resources ◽  
Massive Sulfide ◽  
Ultramafic Rocks ◽  
Energy Potential ◽  
Metallogenic Province ◽  
Metallic Mineral ◽  
Host Rocks

AbstractThe mineral resources of the non-ultramafic rocks of New Caledonia and its Exclusive Economic Zone can be classified according to their host rocks. The metallic mineral resources are essentially associated with volcanic and magmatic activity. Non-economic volcanogenic massive sulfide deposits with Cu and Au are located in the Late Carboniferous Koh Ophiolite and in the Late Cretaceous Poya Terrane. Base metals, Au and Ag of the sedimentary–exhalative type are present in the metamorphic Diahot-Panié Metamorphic Complex, associated with syn-rift volcanism. An Au–Sb metallogenic province is associated with the post-obduction Late Oligocene granitoids and co-genetic hydrothermal silica–carbonate (listwanite) zones in the Peridotite Nappe; Au is disseminated in the granites and Sb occurs as lodes in the silica–carbonate. Among the non-metallic mineral resources, barite, gypsum, magnesite, phosphate, clays, dimension stones, limestone for use as cement and as a neutralizer, and aggregates are all present. Gemstones such as jade and chrysoprase are only used locally. Late Cretaceous coal, which was briefly exploited in the past, is now considered to be a source rock for an offshore potential oil and gas system. Petroleum prospectivity is currently focused on the Fairway Basin. Several low-enthalpy thermo-mineral springs with a weak geothermal energy potential are known on Grande Terre.

Chapter 4 Late Cretaceous to Eocene cover of New Caledonia: from rifting to convergence

2020 ◽  
Vol 51 (1) ◽  
pp. 53-91 ◽  
Author(s):  
P. Maurizot ◽  
A. Bordenave ◽  
D. Cluzel ◽  
J. Collot ◽  
S. Etienne
Keyword(s):  
Late Cretaceous ◽  
Tectonic Evolution ◽  
New Caledonia ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Foreland Basin ◽  
Late Eocene ◽  
Sw Pacific ◽  
Basement Rocks ◽  
Second Period

AbstractIn New Caledonia, the cover refers to the autochthonous Late Cretaceous to Paleogene sedimentary and volcanic formations unconformably overlying the basement rocks and underlying the allochthonous nappes. The first period of deposition, broadly from the Late Cretaceous to Paleocene (c. 105–56 Ma) was controlled by extension and rifting. The second period, broadly the Eocene (c. 56–34 Ma), was dominated by convergence and contraction. The Late Cretaceous part of the cover consists of synrift conglomerates and coal-bearing deposits with interlayered bimodal, subduction-related and intra-plate volcanic rocks. The post-rift deposits are deep water sedimentary rocks deposited under anoxic conditions with reduced terrigenous input. The Paleocene to Eocene formations, mainly carbonates, attest to profound palaeogeographical changes and a switch to a different geodynamic regime, linked to the onset of Eocene convergence. The Middle to Late Eocene formations are typically composed of turbidites and breccias. They were deposited in a typical flexural foreland basin context as an upwards-coarsening sequence topped by an olistostrome. They are associated with tectonic convergence and east-dipping subduction that led to the end-Eocene obduction of ophiolitic nappes. This two-fold evolution, extension then compression, can be integrated in the wider framework of the plate tectonic evolution of the SW Pacific.

scholarly journals Chapter 1 Introduction to New Caledonia: geology, geodynamic evolution and mineral resources

2020 ◽  
Vol 51 (1) ◽  
pp. 1-12 ◽  
Author(s):  
P. Maurizot ◽  
B. Robineau ◽  
M. Vendé-Leclerc ◽  
D. Cluzel
Keyword(s):  
New Caledonia ◽  
Mineral Resources ◽  
Geodynamic Evolution

Maastrichtian representatives of the dragonfly family Aeschnidiidae question the entomofaunal turnover of the early Late Cretaceous

2021 ◽  
Vol 4 (3) ◽  
Author(s):  
ANDRÉ NEL
Keyword(s):  
Late Cretaceous ◽  
Aquatic Insects ◽  
Fossil Record ◽  
Current Knowledge ◽  
Alternative Scenario ◽  
Family Level ◽  
Early Late ◽  
Freshwater Environments

Gaps in the fossil record are the major challenge for estimations of impacts of crises of biodiversity of the various clades. They can lead to important misinterpretations in the effects of the different events on the fauna and flora. It is especially the case for the end-Cretaceous, which is ‘near the midpoint of a 16-million-year gap in the insect fossil record’ (Schachat & Labandeira, 2021: 111). All the important Cretaceous insect Konzentrat Lagerstätten are before the Turonian. The analysis of Schachat et al. (2019) has reconstructed a massive loss of family-level diversity for the insects at the boundary Cretaceous-Cenozoic, a possible artefact due to this gap. An alternative scenario was that a turnover in the entomofauna occurred during the early Late Cretaceous in relation to the floristic changes of the Albian–Cenomanian (Nel et al., 2018). This turnover would have also affected the aquatic insects through important changes in the freshwater environments (Sinitshenkova & Zherikhin, 1996; Ivanov & Sukatsheva, 2002). The current knowledge on the odonatan fossil record suggests a pronounced turnover with the last records of several major clades during the Cenomanian-Turonian and first records of several modern ones during the same period (Nel et al., 2015). The widespread and very diverse Jurassic-Cretaceous family Aeschnidiidae is among the best examples of such extinctions supposed to have occurred after the Cenomanian, because of the absence of any fossil in younger strata.

The Ganj Complex reinterpreted as a Late Cretaceous volcanic arc: Implications for the geodynamic evolution of the North Makran domain (southeast Iran)

2020 ◽  
Vol 195 ◽  
pp. 104306 ◽  
Author(s):  
Edoardo Barbero ◽  
Morteza Delavari ◽  
Asghar Dolati ◽  
Emilio Saccani ◽  
Michele Marroni ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Geodynamic Evolution ◽  
Volcanic Arc ◽  
The North

scholarly journals Distinguishing the Mélange-Forming Processes in Subduction-Accretion Complexes: Constraints from the Anisotropy of Magnetic Susceptibility (AMS)

Geosciences ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 381 ◽  
Author(s):  
Claudio Robustelli Test ◽  
Andrea Festa ◽  
Elena Zanella ◽  
Giulia Codegone ◽  
Emanuele Scaramuzzo
Keyword(s):  
Magnetic Susceptibility ◽  
Late Cretaceous ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Magnetic Fabric ◽  
Early Eocene ◽  
Accretionary Complex ◽  
Geodynamic Evolution ◽  
Structural Investigations ◽  
Laboratory Investigations ◽  
Magnetic Features

The strong morphological similitude of the block-in-matrix fabric of chaotic rock units (mélanges and broken formations) makes problematic the recognition of their primary forming-processes. We present results of the comparison between magnetic fabric and mesoscale structural investigations of non-metamorphic tectonic, sedimentary, and polygenetic mélanges in the exhumed Late Cretaceous to early Eocene Ligurian accretionary complex and overlying wedge-top basin succession in the Northern Apennines (northwest Italy). Our findings show that the magnetic fabric reveals diagnostic configurations of principal anisotropy of magnetic susceptibility (AMS) axes orientation that are well comparable with the mesoscale block-in-matrix fabric of mélanges formed by different processes. Broken formations and tectonic mélanges show prolate and neutral-to-oblate ellipsoids, respectively, with magnetic fabric elements being consistent with those of the mesoscale anisotropic “structurally ordered” block-in-matrix fabric. Sedimentary mélanges show an oblate ellipsoid with a clear sedimentary magnetic fabric related to downslope gravitational emplacement. Polygenetic mélanges show the occurrence of a cumulative depositional and tectonic magnetic fabric. The comparison of field and laboratory investigations validate the analysis of magnetic features as a diagnostic tool suitable to analytically distinguish the contribution of different mélange forming-processes and their mutual superposition, and to better understand the geodynamic evolution of subduction-accretion complexes.

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