U-Pb age of the Baltoro granite, northwest Himalaya, and implications for monazite U-Pb systematics

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1989)017<1076:UPAOTB>2.3.CO;2· OSTI ID:7135771

Parrish, R R; Tirrul, R ^[1]

---

1. Geological Survey of Canada, Ottawa, Ontario (Canada)

The Baltoro granite is a major late- to post-tectonic plutonic phase of the Karakoram batholith of the northwest Himalaya in northern Pakistan. U-Pb zircon analyses indicate both emplacement at 21.0{plus minus}0.5 Ma and significant Precambrian zircon inheritance. Dates on monazite are 17-19 Ma and are interpreted to have remained near their closure temperature of about 700C for several million years after emplacement, resulting in Pb loss by diffusion. The authors suggest that the granite was emplaced into rocks which were at high temperature and that they remained so until late Miocene northeast-tilting, rapid uplift and/or tectonic denudation, and cooling.

• OSTI ID: 7135771
• Journal Information: Geology; (USA), Vol. 17:12; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GRANITES
AGE ESTIMATION
HIMALAYAS
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGY
ISOTOPE DATING
ISOTOPE RATIO
LEAD
OROGENESIS
PAKISTAN
TECTONICS
TEMPERATURE DEPENDENCE
URANIUM
ZIRCON
ACTINIDES
ASIA
DEVELOPING COUNTRIES
ELEMENTS
IGNEOUS ROCKS
METALS
MINERALS
MOUNTAINS
OXYGEN COMPOUNDS
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES
580000* - Geosciences