Weird turn all-in

CraigSG1

This is a hand from a £2.30BH. We are deep and I'm new to this table and I am 2nd in chips out of 30ish. 

Its all standard until the turn where my opponent just jams! Its a total blank as the flop and turn are all one suit each. 

I decide to fold because I have the table chip lead and have been controlling the table so far winning a lot of small pots without showdown and I dont want to lose my ability to do this. What do we do? Is folding correct?

Hand History #725128994 (19:34 27/12/2013)

Player	Action	Cards	Amount	Pot	Balance
Mikeycb	Small blind		150.00	150.00	20442.61
ela990	Big blind		300.00	450.00	10792.50
	Your hole cards	J K
horsebox	Fold
CraigSG1	Raise		600.00	1050.00	21667.32
tantulus50	Fold
kurdymac	Fold
Mikeycb	Fold
ela990	Call		300.00	1350.00	10492.50
Flop
		J 3 9
ela990	Check
CraigSG1	Bet		600.00	1950.00	21067.32
ela990	Call		600.00	2550.00	9892.50
Turn
		2
ela990	All-in		9892.50	12442.50	0.00
CraigSG1	Fold
ela990	Muck
ela990	Win		2550.00		2550.00
ela990	Return		9892.50	0.00	12442.50

jimb0d1

Looks fishy to me but I probably fold for same reason as you. Pick up the easy pots. 

CraigSG1

Yeah, me too but it was such a dry board that i'm either miles ahead or miles behind. Im probably ahead more times than not but I choose the nittier line. Its one of those your dying for the guy to show!