Insights into Fluid-Rock Interactions on the CV3 Chondrite Parent Body through the Use of Secondary Garnets in the Allende CV3 Chondrite and Terrestrial Skarns

Garnets are valuable for studying geologic processes, particularly fluid-rock interactions in terrestrial skarns. This dissertation examines secondary garnets and associated Ca-Fe silicates in Allende-like CV3 chondrites and terrestrial skarns to assess garnets as recorders of fluid-rock interactions. Chapter 2 investigates garnets from the Willsboro-Lewis skarn, revealing that mineral separate techniques misrepresent rare earth element (REE) signatures. Chapter 3 examines garnets and clinopyroxenes from the Victorio Mining District skarn, showing that REE incorporation was controlled by fluid composition rather than crystal chemistry. Chapters 4 and 5 focus on extraterrestrial samples. Chapter 4 finds that garnets and pyroxenes in Allende CV3 matrix nodules precipitated from aqueous fluids, with vi REEs remaining immobile. Chapter 5 shows that CAI-associated garnets formed through pseudomorphism and fluid precipitation, with REEs inherited from matrix fluids, and Ba behaving similarly to Ca during alteration.