10.6084/m9.figshare.3454385.v1
SHUAN-HONG ZHANG
SHUAN-HONG
ZHANG
YUE ZHAO
YUE
ZHAO
BIAO SONG
BIAO
SONG
ZHEN-YU YANG
ZHEN-YU
YANG
JIAN-MIN HU
JIAN-MIN
HU
HAI WU
HAI
WU
Carboniferous granitic plutons from the northern margin of the North China block: implications for a late Palaeozoic active
continental margin
Geological Society of London
2016
tectonic history
granitic plutons
Mongolia
Precambrian basement
Carboniferous granitic plutons
Orogenic Belt
ion microprobe
290 Ma
Geochemical data
North China block
Palaeozoic zircon
Geology
2016-06-21 12:05:20
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/Carboniferous_granitic_plutons_from_the_northern_margin_of_the_North_China_block_implications_for_a_late_Palaeozoic_active___continental_margin/3454385
<p>We report four late Palaeozoic zircon sensitive high-resolution ion microprobe (SHRIMP) U–Pb ages for granitic plutons from
the Inner Mongolia Palaeo-uplift on the northern margin of the North China block. These cast a new light on the poorly understood
tectonic history of the northern margin of the North China block and the Central Asian Orogenic Belt during the late Palaeozoic.
The plutons have for a long time been considered to belong to the early Precambrian basement of the North China block. Our
new SHRIMP U–Pb zircon dating of four plutons at Longhua, Daguangding, Boluonuo and Hushiha has yielded intrusive ages of
311 ± 2 Ma, 324 ± 6 Ma, 302 ± 4 Ma and 310 ± 5 Ma, respectively. Geochemical data suggest that these granitoids have a calc-alkaline,
subduction-related I-type signature, indicating the existence of an Andean-style continental arc along the northern margin
of the North China block during the late Palaeozoic. Our results also indicate that the Palaeo-Asian Ocean still existed during
latest Carboniferous–earliest Permian time, and that the final collision between the southern Mongolia composite terranes
and the North China block occurred later than <em>c</em>. 290 Ma. We suggest that the northern margin of the North China block was an active continental margin and the Inner Mongolia
Palaeo-uplift is a deeply exhumed mid-crustal ‘root’ of a late Palaeozoic Andean-style continental arc.
</p>