Citation

Page, R.W., 1976. Geochronology of igneous and metamorphic rocks in the New Guinea Highlands. Bulletin  162. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

The island of New Guinea lies in an area of complex tectonic interaction between the relatively stable Australian continental landmass and the geologically active circum-Pacific Belt. Thus the Palaeo-zoic - Mesozoichistory of the southern half of the island is closely related t o the Palaeozoic - Mesozoic development of northeastern Australia, whereas in the northern half of the island there are Cainozoic geosynclinal and volcanic belts which cross-cut the Palaeozoic - Mesozoic basement and are parallel to the circum-Pacific margin in this region. In mainland Papua New Guinea, intrusive igneous activity before Tertiary time was restricted to the southern part of the Central Highlands and, from the data available, appears to have been rather sporadic. The Upper Permian Kubor Granodiorite, dated at about 2 4 0 m.y., represents the largest and oldest-known igneous massif in New Guinea. A number of small Mesozoic granitic bodies were emplaced in the Early Jurassic (190m.y), Early to Mid-Jurassic (172m.y) , and mid-Cretaceous (90m.y). Increased tectonism in the mid-Tertiary is evidenced by several late Oligocene and early Miocene results (26 to 20 m.y. range) in four metamorphic terrains and in granitic intrusives in the south Sepik area. Volcanic and plutonic igneous activity reached a climax in the mid - Miocene , between 12 and 15 m.y. ago. K - Ar dating on some of these volcanic rocks in close stratigraphic relationship with palaeontologically controlled sedimentary rocks provided the basis for constructing a physical time scale for the East Indies letter stages. The 12-15 m.y. (mid - Miocene) pulse of plutonic activity continued to a lesser degree in the late Miocene and Pliocene. These Miocene - Pliocene bodies lie in an arcuate northwest-trending belt (New Guinea Mobile Belt) over 700km long. Porphyry copper and gold mineralization events are temporally and spatially associated with the middle Miocene and Pliocene high-level intrusives in this belt. All the volcanic and plutonic rocks have low initial Sr 87 / Sr 86 ratios, suggesting that they were derived from mantle sources with little or no contamination by crustal material. A close relation between the major tectonic processes of faulting, volcanism, and plutonism in the New Guinea Mobile Belt, over a relatively short time span of a few million years in the mid - Miocene, corresponds to the waning stages of the Papuan Geosyncline sedimentary history and the beginning of the main mountain-building processes in the New Guinea highlands. It is hypothesized that this climactic upsurge in the tectonic history of New Guinea was triggered in the early to mid - Miocene by interaction and collision between the Pacific Plate and the northward-moving Australian Plate, which has New Guinea at its leading edge.
Google map showing geographic bounding box with values North bound -2.5 East bound 148.0 West bound 140.0 South bound -10.0
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Product Type/Sub Type

dataset - GA Publication - Bulletin

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1976

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Bulletin
geochronology
geology
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-2.5
East bound
148.0
West bound
140.0
South bound
-10.0

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-7fab-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

1996-10-29

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays