| A detailed study of fabric relations was conducted at internal contacts of the west-central portion of the Tuolumne Intrusive Suite. Two weak constrictional magmatic fabrics, one contact-parallel and one oriented ∼270°--290°, were documented at and near contacts between the Equigranular Half Dome, Porphyritic Half Dome, and Cathedral Peak Granodiorites, demonstrating that large scale foliation patterns in the suite also persist on a small scale. Crosscutting relationships and orientations relative to contacts and other magmatic structures indicate that contact-parallel foliations formed via internal pluton processes and are older than the ∼270°--290° foliation which records regional strain. Contacts were dynamic environments hosting a variety of magmatic structures when the fabrics formed. Anisotropy of magnetic susceptibility and shape preferred orientation fabric analysis confirm the presence of multiple fabrics at single locations at the hand sample scale. |
