Sunday, May 07, 2017

Drunk on Geology - Jip Jip Rocks

The next up in our Drunk on Geology series is Jip Jip Rocks Shiraz from the Jip Jip Rocks Winery in Padthaway, Australia. 



 Text from the back of the bottle:
"The Jip Jip Rocks are a striking outcrop of 350 million year old pink-red granite in the heart of the Padthaway region, which are sacred in traditional Aboriginal beliefs. 
Jip Jip Rocks Shiraz is the essence of Australian Wine, embodying a pioneering spirit built from youthful enthusiasm and a lot of vineyard character.
Family owned and operated, Jip Jip Rocks is as independent as we are remote 
The wines we make express the best of the Padthaway region, where not only the ancient soils, but also the maritime climate are ideal for growing grapes, particularly our beloved Shiraz. 
Jip Jip Rocks is a bottle of serious fun and a great cellaring proposition, however we believe this shiraz is approachable now more so when shared with food, friends and conversation."


However, contrary to what the bottle states, there are no "Jip Jip Rocks" as such. The Jip Jip Conservation Park is a park in South Australia that hosts an uplifted hill of granitic boulders from the Mannum Formation. The Jip Jip Conservation Park is located within an area known as the Limestone Coast.

Portion of South Australia geologic map. Highlighted spot is the one of the Mannum Granite outcrops around the Jip Jip Conservation Park. 

The Mannum Granite is a typical "Type-A" granite, that intruded into the Adelaide Fold Belt during the Early Ordovician (482 Ma), soon after the cessation of the Delamerian Orogen (Pankhurst et al., 2011).

Type-A granites (anorogenic), are granites that form in rift zones or within stable continental blocks. They have low CaO and Al2O3, high Fe/Fe+Mg, and high K2O/Na2O content. They also have low water content upon formation (UMass).

The Mammum granites within the Jip Jip Conservation Park. 
The Delamerian Orogeny occurred during the end of the Cambrian into the early Ordovician at the same time as the Ross Orogeny in Antarctica, both resulting from the transfer of stress to the trailing edges of the newly formed Gondwana supercontinent.

Following deformation during the orogenies, post-tectonic magmatism began that was derived substantially from the mantle. The Mannum Granite was formed during this magmatism. This magmatism was likely caused by a combination of extensional activity of the lithosphere and detachment of lithospheric mantle (austhrutime.com).

Glamour shot
After roughly 500 million years of erosion, the overlying sedimentary rocks had been eroded exposing the basement granites, like the Mannum Granite, in select areas. The Mannum Granite is a circular body of granite, exposed primarily around the Jip Jip Conservation Park.

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