Siberia Crater (Dish Hill), Saturday, Feb 23, 2018
This fieldtrip is still on, the forecast predicts no rain on Saturday or before. However, it will be very cold, especially in the morning, so for your own sake do not show up in shorts and flip-flops 😉
We will meet at 10:00 AM at the Trojan dirt road turnoff off Route 66. It’s 176 miles from Pasadena, a three-hour+ drive, so the late sleepers are advised to take advantage of a motel in Barstow. Here are the GPS coordinates of the meeting place: 34°35’59.3″N 115°56’41.3″W (34.599797, -115.944798) and a Google map link: https://goo.gl/maps/3Yksato2DkN2
We will leave for the basanite quarry shortly after 10:00 AM, the well-maintained dirt road goes under the railroad, then gets a little bit rough close to the crater, so the sedans are not advisable. If you arrive late, head north for half a mile on the dirt road to meet with us at the quarry.
The crater area has excellent large phenocrysts of deep mantle minerals like kaersutite, Ti-bearing augite, titanomagnetite, and forsterite, as well as rare micro zeolites like phillipsite and very rare octahedral faujasite. The cone is very unusual geologically, it’s a very alkaline volcanic rock called basanite. Another very rare alkaline mineral has been identified from there: quintinite from the hydrotalcite group.
See you all there,